diff --git a/CODEOWNERS b/CODEOWNERS
index 34ec4bc2bd..821d2e5e74 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -404,6 +404,7 @@ esphome/components/pn7160_i2c/* @jesserockz @kbx81
 esphome/components/pn7160_spi/* @jesserockz @kbx81
 esphome/components/power_supply/* @esphome/core
 esphome/components/preferences/* @esphome/core
+esphome/components/provisioning/* @esphome/core
 esphome/components/psram/* @esphome/core
 esphome/components/pulse_meter/* @cstaahl @stevebaxter @TrentHouliston
 esphome/components/pvvx_mithermometer/* @pasiz
diff --git a/esphome/components/api/__init__.py b/esphome/components/api/__init__.py
index 11ada7e970..64b025fee1 100644
--- a/esphome/components/api/__init__.py
+++ b/esphome/components/api/__init__.py
@@ -112,6 +112,23 @@ CONF_MAX_SEND_QUEUE = "max_send_queue"
 CONF_STATE_SUBSCRIPTION_ONLY = "state_subscription_only"
 
 
+def _register_provisioning_source(config: ConfigType) -> ConfigType:
+    """Register the API as a provisioning source when encryption is enabled.
+
+    With no ``key`` the device boots unprovisioned and is set up on first
+    connection; a YAML ``key`` means it is born provisioned. Either way the API
+    drives the provisioning manager, so it counts as a source for `provisioning:`.
+    A hardcoded ``key`` is reported so `provisioning:` can warn about it.
+    """
+    if (encryption := config.get(CONF_ENCRYPTION)) is not None:
+        from esphome.components import provisioning
+
+        provisioning.register_source("api")
+        if CONF_KEY in encryption:
+            provisioning.report_hardcoded_credentials("api")
+    return config
+
+
 def validate_encryption_key(value):
     value = cv.string_strict(value)
     try:
@@ -337,6 +354,7 @@ CONFIG_SCHEMA = cv.All(
     ).extend(cv.COMPONENT_SCHEMA),
     cv.rename_key(CONF_SERVICES, CONF_ACTIONS),
     _consume_api_sockets,
+    _register_provisioning_source,
 )
 
 
diff --git a/esphome/components/api/api.proto b/esphome/components/api/api.proto
index f4f15c1042..86707d9810 100644
--- a/esphome/components/api/api.proto
+++ b/esphome/components/api/api.proto
@@ -158,6 +158,16 @@ message AuthenticationResponse {
   bool invalid_password = 1;
 }
 
+// Reason a party is requesting the connection be closed.
+enum DisconnectReason {
+  // No specific reason / not provided (default for older peers).
+  DISCONNECT_REASON_UNSPECIFIED = 0;
+  // The device's provisioning window has expired. The device must be reset
+  // (power-cycled) to reopen the provisioning window before it will accept a
+  // connection again.
+  DISCONNECT_REASON_PROVISIONING_CLOSED = 1;
+}
+
 // Request to close the connection.
 // Can be sent by both the client and server
 message DisconnectRequest {
@@ -166,6 +176,10 @@ message DisconnectRequest {
   option (no_delay) = true;
 
   // Do not close the connection before the acknowledgement arrives
+
+  // Optional reason the connection is being closed. Older peers that do not
+  // send this field will report DISCONNECT_REASON_UNSPECIFIED (0).
+  DisconnectReason reason = 1;
 }
 
 message DisconnectResponse {
diff --git a/esphome/components/api/api_connection.cpp b/esphome/components/api/api_connection.cpp
index cb7d1b9d1e..dcb1478ec8 100644
--- a/esphome/components/api/api_connection.cpp
+++ b/esphome/components/api/api_connection.cpp
@@ -25,6 +25,9 @@
 #include "esphome/core/hal.h"
 #include "esphome/core/log.h"
 #include "esphome/core/version.h"
+#ifdef USE_PROVISIONING
+#include "esphome/components/provisioning/provisioning.h"
+#endif
 
 #ifdef USE_DEEP_SLEEP
 #include "esphome/components/deep_sleep/deep_sleep_component.h"
@@ -1724,6 +1727,19 @@ bool APIConnection::send_hello_response_(const HelloRequest &msg) {
   resp.server_info = ESPHOME_VERSION_REF;
   resp.name = StringRef(App.get_name());
 
+#ifdef USE_PROVISIONING
+  if (provisioning::global_provisioning_manager != nullptr && provisioning::global_provisioning_manager->closed()) {
+    // The provisioning window has closed without the device being provisioned.
+    // Acknowledge the hello so the client can read the server name, then request
+    // disconnect with the reason. Authentication is intentionally not completed.
+    this->log_client_(ESPHOME_LOG_LEVEL_WARN, LOG_STR("Provisioning closed; rejecting connection"));
+    this->send_message(resp);
+    DisconnectRequest req;
+    req.reason = enums::DISCONNECT_REASON_PROVISIONING_CLOSED;
+    return this->send_message(req);
+  }
+#endif
+
   // Auto-authenticate - password auth was removed in ESPHome 2026.1.0
   this->complete_authentication_();
 
@@ -1874,7 +1890,8 @@ void APIConnection::on_hello_request(const HelloRequest &msg) {
     this->on_fatal_error();
   }
 }
-void APIConnection::on_disconnect_request() {
+void APIConnection::on_disconnect_request(const DisconnectRequest & /*msg*/) {
+  // The reason is informational when a client disconnects us; we always ack and close.
   if (!this->send_disconnect_response_()) {
     this->on_fatal_error();
   }
@@ -2002,6 +2019,15 @@ bool APIConnection::send_noise_encryption_set_key_response_(const NoiseEncryptio
   NoiseEncryptionSetKeyResponse resp;
   resp.success = false;
 
+#ifdef USE_PROVISIONING
+  // Refuse to set a key once the provisioning window has closed (defense in depth;
+  // such connections are already rejected at hello).
+  if (provisioning::global_provisioning_manager != nullptr && provisioning::global_provisioning_manager->closed()) {
+    ESP_LOGW(TAG, "Provisioning closed; rejecting key set");
+    return this->send_message(resp);
+  }
+#endif
+
   psk_t psk{};
   if (msg.key_len == 0) {
     if (this->parent_->clear_noise_psk(true)) {
diff --git a/esphome/components/api/api_connection.h b/esphome/components/api/api_connection.h
index dae5fc92fd..d6d3e4d26b 100644
--- a/esphome/components/api/api_connection.h
+++ b/esphome/components/api/api_connection.h
@@ -259,7 +259,7 @@ class APIConnection final : public APIServerConnectionBase {
   void on_get_time_response(const GetTimeResponse &value);
 #endif
   void on_hello_request(const HelloRequest &msg);
-  void on_disconnect_request();
+  void on_disconnect_request(const DisconnectRequest &msg);
   void on_ping_request();
   void on_device_info_request();
   void on_list_entities_request() { this->begin_iterator_(ActiveIterator::LIST_ENTITIES); }
diff --git a/esphome/components/api/api_pb2.cpp b/esphome/components/api/api_pb2.cpp
index c711ef167c..de6ae4751e 100644
--- a/esphome/components/api/api_pb2.cpp
+++ b/esphome/components/api/api_pb2.cpp
@@ -47,6 +47,26 @@ uint32_t HelloResponse::calculate_size() const {
   size += 2 + this->name.size();
   return size;
 }
+bool DisconnectRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
+  switch (field_id) {
+    case 1:
+      this->reason = static_cast<enums::DisconnectReason>(value);
+      break;
+    default:
+      return false;
+  }
+  return true;
+}
+uint8_t *DisconnectRequest::encode(ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM) const {
+  uint8_t *__restrict__ pos = buffer.get_pos();
+  ProtoEncode::encode_uint32(pos PROTO_ENCODE_DEBUG_ARG, 1, static_cast<uint32_t>(this->reason));
+  return pos;
+}
+uint32_t DisconnectRequest::calculate_size() const {
+  uint32_t size = 0;
+  size += this->reason ? 2 : 0;
+  return size;
+}
 #ifdef USE_AREAS
 uint8_t *AreaInfo::encode(ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM) const {
   uint8_t *__restrict__ pos = buffer.get_pos();
diff --git a/esphome/components/api/api_pb2.h b/esphome/components/api/api_pb2.h
index 7e926ee0d4..d268a40c56 100644
--- a/esphome/components/api/api_pb2.h
+++ b/esphome/components/api/api_pb2.h
@@ -11,6 +11,10 @@ namespace esphome::api {
 
 namespace enums {
 
+enum DisconnectReason : uint32_t {
+  DISCONNECT_REASON_UNSPECIFIED = 0,
+  DISCONNECT_REASON_PROVISIONING_CLOSED = 1,
+};
 enum SerialProxyPortType : uint32_t {
   SERIAL_PROXY_PORT_TYPE_TTL = 0,
   SERIAL_PROXY_PORT_TYPE_RS232 = 1,
@@ -427,18 +431,22 @@ class HelloResponse final : public ProtoMessage {
 
  protected:
 };
-class DisconnectRequest final : public ProtoMessage {
+class DisconnectRequest final : public ProtoDecodableMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 5;
-  static constexpr uint8_t ESTIMATED_SIZE = 0;
+  static constexpr uint8_t ESTIMATED_SIZE = 2;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const LogString *message_name() const override { return LOG_STR("disconnect_request"); }
 #endif
+  enums::DisconnectReason reason{};
+  uint8_t *encode(ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM) const;
+  uint32_t calculate_size() const;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *dump_to(DumpBuffer &out) const override;
 #endif
 
  protected:
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class DisconnectResponse final : public ProtoMessage {
  public:
diff --git a/esphome/components/api/api_pb2_dump.cpp b/esphome/components/api/api_pb2_dump.cpp
index 850ad37bc9..3a1ceba95f 100644
--- a/esphome/components/api/api_pb2_dump.cpp
+++ b/esphome/components/api/api_pb2_dump.cpp
@@ -125,6 +125,16 @@ static void dump_bytes_field(DumpBuffer &out, const char *field_name, const uint
 }
 #pragma GCC diagnostic pop
 
+template<> const char *proto_enum_to_string<enums::DisconnectReason>(enums::DisconnectReason value) {
+  switch (value) {
+    case enums::DISCONNECT_REASON_UNSPECIFIED:
+      return ESPHOME_PSTR("DISCONNECT_REASON_UNSPECIFIED");
+    case enums::DISCONNECT_REASON_PROVISIONING_CLOSED:
+      return ESPHOME_PSTR("DISCONNECT_REASON_PROVISIONING_CLOSED");
+    default:
+      return ESPHOME_PSTR("UNKNOWN");
+  }
+}
 template<> const char *proto_enum_to_string<enums::SerialProxyPortType>(enums::SerialProxyPortType value) {
   switch (value) {
     case enums::SERIAL_PROXY_PORT_TYPE_TTL:
@@ -864,7 +874,8 @@ const char *HelloResponse::dump_to(DumpBuffer &out) const {
   return out.c_str();
 }
 const char *DisconnectRequest::dump_to(DumpBuffer &out) const {
-  out.append_p(ESPHOME_PSTR("DisconnectRequest {}"));
+  MessageDumpHelper helper(out, ESPHOME_PSTR("DisconnectRequest"));
+  dump_field(out, ESPHOME_PSTR("reason"), static_cast<enums::DisconnectReason>(this->reason));
   return out.c_str();
 }
 const char *DisconnectResponse::dump_to(DumpBuffer &out) const {
diff --git a/esphome/components/api/api_pb2_service.cpp b/esphome/components/api/api_pb2_service.cpp
index 0ba2961a13..5c9df433dd 100644
--- a/esphome/components/api/api_pb2_service.cpp
+++ b/esphome/components/api/api_pb2_service.cpp
@@ -51,10 +51,12 @@ void APIConnection::read_message_(uint32_t msg_size, uint32_t msg_type, const ui
       break;
     }
     case DisconnectRequest::MESSAGE_TYPE: {
+      DisconnectRequest msg;
+      msg.decode(msg_data, msg_size);
 #ifdef HAS_PROTO_MESSAGE_DUMP
-      this->log_receive_message_(LOG_STR("on_disconnect_request"));
+      this->log_receive_message_(LOG_STR("on_disconnect_request"), msg);
 #endif
-      this->on_disconnect_request();
+      this->on_disconnect_request(msg);
       break;
     }
     case DisconnectResponse::MESSAGE_TYPE: {
diff --git a/esphome/components/api/api_pb2_service.h b/esphome/components/api/api_pb2_service.h
index aca42ca303..d1b51f4846 100644
--- a/esphome/components/api/api_pb2_service.h
+++ b/esphome/components/api/api_pb2_service.h
@@ -21,7 +21,7 @@ class APIServerConnectionBase {
 
   void on_hello_request(const HelloRequest &value){};
 
-  void on_disconnect_request(){};
+  void on_disconnect_request(const DisconnectRequest &value){};
   void on_disconnect_response(){};
   void on_ping_request(){};
   void on_ping_response(){};
diff --git a/esphome/components/api/api_server.cpp b/esphome/components/api/api_server.cpp
index efdeb6991b..1062dfeb39 100644
--- a/esphome/components/api/api_server.cpp
+++ b/esphome/components/api/api_server.cpp
@@ -107,8 +107,30 @@ void APIServer::setup() {
 
   // Initialize last_connected_ for reboot timeout tracking
   this->last_connected_ = App.get_loop_component_start_time();
-  // Set warning status if reboot timeout is enabled
-  if (this->reboot_timeout_ != 0) {
+#if defined(USE_PROVISIONING) && defined(USE_API_NOISE)
+  // Register with the provisioning manager (provisioning:) as a source and
+  // report our current state (provisioned == an encryption key is set). When the
+  // window closes, disconnect any client still attempting to provision so it learns
+  // the reason. The manager owns the timeout, window state and on_timeout automation.
+  if (provisioning::global_provisioning_manager != nullptr) {
+    this->provisioning_source_ = provisioning::global_provisioning_manager->register_source();
+    provisioning::global_provisioning_manager->set_source_provisioned(this->provisioning_source_,
+                                                                      this->noise_ctx_.has_psk());
+    provisioning::global_provisioning_manager->add_on_closed_callback([this]() {
+      for (auto &c : this->active_clients()) {
+        DisconnectRequest req;
+        req.reason = enums::DISCONNECT_REASON_PROVISIONING_CLOSED;
+        // Best-effort: if the send buffer is full the reason is dropped, but the
+        // client still learns the window is closed when it reconnects (rejected at
+        // hello) or via the socket close.
+        c->send_message(req);
+      }
+    });
+  }
+#endif
+  // Set warning status if reboot timeout is enabled (suppressed while provisioning
+  // is pending so the device waits to be onboarded instead of rebooting).
+  if (this->reboot_timeout_ != 0 && !this->provisioning_pending_()) {
     this->status_set_warning(LOG_STR("waiting for client connection"));
   }
 }
@@ -121,8 +143,10 @@ void APIServer::loop() {
 
   if (this->api_connection_count_ == 0) {
     // Check reboot timeout - done in loop to avoid scheduler heap churn
-    // (cancelled scheduler items sit in heap memory until their scheduled time)
-    if (this->reboot_timeout_ != 0) {
+    // (cancelled scheduler items sit in heap memory until their scheduled time).
+    // Suppressed while a provisioning window is pending so the device waits to be
+    // onboarded / reset instead of rebooting itself; resumes once provisioned.
+    if (this->reboot_timeout_ != 0 && !this->provisioning_pending_()) {
       const uint32_t now = App.get_loop_component_start_time();
       if (now - this->last_connected_ > this->reboot_timeout_) {
         ESP_LOGE(TAG, "No clients; rebooting");
@@ -194,7 +218,8 @@ void APIServer::remove_client_(uint8_t client_index) {
   this->clients_[last_index].reset();
 
   // Last client disconnected - set warning and start tracking for reboot timeout
-  if (this->api_connection_count_ == 0 && this->reboot_timeout_ != 0) {
+  // (suppressed while provisioning is pending - see loop()).
+  if (this->api_connection_count_ == 0 && this->reboot_timeout_ != 0 && !this->provisioning_pending_()) {
     this->status_set_warning(LOG_STR("waiting for client connection"));
     this->last_connected_ = App.get_loop_component_start_time();
   }
@@ -232,7 +257,7 @@ void __attribute__((flatten)) APIServer::accept_new_connections_() {
     conn->start();
 
     // First client connected - clear warning and update timestamp
-    if (this->api_connection_count_ == 1 && this->reboot_timeout_ != 0) {
+    if (this->api_connection_count_ == 1 && this->reboot_timeout_ != 0 && !this->provisioning_pending_()) {
       this->status_clear_warning();
       this->last_connected_ = App.get_loop_component_start_time();
     }
@@ -572,8 +597,16 @@ bool APIServer::save_noise_psk(psk_t psk, bool make_active) {
   }
 
   SavedNoisePsk new_saved_psk{psk};
-  return this->update_noise_psk_(new_saved_psk, LOG_STR("Noise PSK saved"), LOG_STR("Failed to save Noise PSK"),
-                                 make_active);
+  bool result = this->update_noise_psk_(new_saved_psk, LOG_STR("Noise PSK saved"), LOG_STR("Failed to save Noise PSK"),
+                                        make_active);
+#ifdef USE_PROVISIONING
+  // The device now has a key; report provisioned so the provisioning window is
+  // satisfied and the reboot timeout resumes normal operation.
+  if (result && provisioning::global_provisioning_manager != nullptr) {
+    provisioning::global_provisioning_manager->set_source_provisioned(this->provisioning_source_, true);
+  }
+#endif
+  return result;
 #endif
 }
 bool APIServer::clear_noise_psk(bool make_active) {
@@ -584,8 +617,16 @@ bool APIServer::clear_noise_psk(bool make_active) {
   return false;
 #else
   SavedNoisePsk empty_psk{};
-  return this->update_noise_psk_(empty_psk, LOG_STR("Noise PSK cleared"), LOG_STR("Failed to clear Noise PSK"),
-                                 make_active);
+  bool result = this->update_noise_psk_(empty_psk, LOG_STR("Noise PSK cleared"), LOG_STR("Failed to clear Noise PSK"),
+                                        make_active);
+#ifdef USE_PROVISIONING
+  // The key was cleared; report unprovisioned so a subsequent reboot reopens the
+  // provisioning window.
+  if (result && provisioning::global_provisioning_manager != nullptr) {
+    provisioning::global_provisioning_manager->set_source_provisioned(this->provisioning_source_, false);
+  }
+#endif
+  return result;
 #endif
 }
 #endif
diff --git a/esphome/components/api/api_server.h b/esphome/components/api/api_server.h
index 16b5762f68..248b83a0ff 100644
--- a/esphome/components/api/api_server.h
+++ b/esphome/components/api/api_server.h
@@ -14,6 +14,9 @@
 #include "esphome/core/controller.h"
 #include "esphome/core/log.h"
 #include "esphome/core/string_ref.h"
+#ifdef USE_PROVISIONING
+#include "esphome/components/provisioning/provisioning.h"
+#endif
 #ifdef USE_LOGGER
 #include "esphome/components/logger/logger.h"
 #endif
@@ -255,6 +258,19 @@ class APIServer final : public Component,
   // Remove a disconnected client by index. Swaps with the last populated slot and resets it.
   void __attribute__((noinline)) remove_client_(uint8_t client_index);
 
+#ifdef USE_PROVISIONING
+  // True while a configured provisioning window is still pending (the device is
+  // unprovisioned). Suppresses the reboot timeout and its warning so the device is
+  // not auto-rebooted while waiting to be provisioned. False when no provisioning
+  // window is configured.
+  bool provisioning_pending_() const {
+    return provisioning::global_provisioning_manager != nullptr &&
+           provisioning::global_provisioning_manager->window_pending();
+  }
+#else
+  bool provisioning_pending_() const { return false; }
+#endif
+
 #ifdef USE_API_NOISE
   bool update_noise_psk_(const SavedNoisePsk &new_psk, const LogString *save_log_msg, const LogString *fail_log_msg,
                          bool make_active);
@@ -332,7 +348,10 @@ class APIServer final : public Component,
   uint8_t listen_backlog_{4};
   bool shutting_down_ = false;
   uint8_t api_connection_count_{0};
-  // 7 bytes used, 1 byte padding
+#if defined(USE_PROVISIONING) && defined(USE_API_NOISE)
+  // Index assigned by the provisioning manager for reporting this transport's state.
+  uint8_t provisioning_source_{0};
+#endif
 
 #ifdef USE_API_NOISE
   APINoiseContext noise_ctx_;
diff --git a/esphome/components/esp32_improv/esp32_improv_component.cpp b/esphome/components/esp32_improv/esp32_improv_component.cpp
index e6fcc018d9..6e3a4ef526 100644
--- a/esphome/components/esp32_improv/esp32_improv_component.cpp
+++ b/esphome/components/esp32_improv/esp32_improv_component.cpp
@@ -7,6 +7,10 @@
 #include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
 
+#ifdef USE_PROVISIONING
+#include "esphome/components/provisioning/provisioning.h"
+#endif
+
 #ifdef USE_ESP32
 
 namespace esphome::esp32_improv {
@@ -41,6 +45,15 @@ void ESP32ImprovComponent::setup() {
 #endif
   global_ble_server->on_disconnect([this](uint16_t conn_id) { this->set_error_(improv::ERROR_NONE); });
 
+#ifdef USE_PROVISIONING
+  if (provisioning::global_provisioning_manager != nullptr) {
+    provisioning::global_provisioning_manager->add_on_closed_callback([this]() {
+      ESP_LOGD(TAG, "Provisioning window closed; stopping Improv");
+      this->stop();
+    });
+  }
+#endif
+
   // Start with loop disabled - will be enabled by start() when needed
   this->disable_loop();
 }
@@ -282,6 +295,15 @@ void ESP32ImprovComponent::start() {
   if (this->should_start_ || this->state_ != improv::STATE_STOPPED)
     return;
 
+#ifdef USE_PROVISIONING
+  // Don't (re)start advertising once the provisioning window has closed - e.g. when
+  // wifi tries to restart Improv after the window expired at runtime.
+  if (provisioning::global_provisioning_manager != nullptr && provisioning::global_provisioning_manager->closed()) {
+    ESP_LOGD(TAG, "Provisioning window closed; not starting Improv");
+    return;
+  }
+#endif
+
   ESP_LOGD(TAG, "Setting Improv to start");
   this->should_start_ = true;
   this->enable_loop();
@@ -338,6 +360,15 @@ void ESP32ImprovComponent::process_incoming_data_() {
           this->incoming_data_.clear();
           return;
         }
+#ifdef USE_PROVISIONING
+        if (provisioning::global_provisioning_manager != nullptr &&
+            provisioning::global_provisioning_manager->closed()) {
+          ESP_LOGW(TAG, "Provisioning window closed; refusing settings");
+          this->set_error_(improv::ERROR_NOT_AUTHORIZED);
+          this->incoming_data_.clear();
+          return;
+        }
+#endif
         if (wifi::global_wifi_component->is_disabled()) {
           // Wi-Fi is disabled, so we can't provision. Respond immediately
           // instead of letting the client wait out its provisioning timeout.
diff --git a/esphome/components/network/__init__.py b/esphome/components/network/__init__.py
index b7dfb8d6d2..0f4bcb3e16 100644
--- a/esphome/components/network/__init__.py
+++ b/esphome/components/network/__init__.py
@@ -25,6 +25,20 @@ NetworkComponent = network_ns.class_("NetworkComponent", cg.Component)
 IPAddress = network_ns.class_("IPAddress")
 
 
+def _register_provisioning_source(config: ConfigType) -> ConfigType:
+    """Register network connectivity as a provisioning source.
+
+    The network component is auto-loaded whenever an interface (wifi, ethernet, ...)
+    is configured, so a device with connectivity always has this source: it is
+    considered provisioned once it has connected via any interface, and
+    `provisioning:` is valid without another source.
+    """
+    from esphome.components import provisioning
+
+    provisioning.register_source("network")
+    return config
+
+
 def ip_address_literal(ip: str | int | None) -> cg.MockObj:
     """Generate an IPAddress with compile-time initialization instead of runtime parsing.
 
@@ -128,36 +142,41 @@ def validate_ipv6(value: bool) -> bool:
     return value
 
 
-CONFIG_SCHEMA = cv.Schema(
-    {
-        cv.GenerateID(): cv.declare_id(NetworkComponent),
-        cv.SplitDefault(
-            CONF_ENABLE_IPV6,
-            bk72xx=False,
-            esp32=False,
-            esp8266=False,
-            host=False,
-            rp2=False,
-            nrf52=True,
-        ): cv.All(
-            cv.boolean,
-            cv.Any(
-                cv.require_framework_version(
-                    bk72xx_arduino=cv.Version(1, 7, 0),
-                    esp_idf=cv.Version(0, 0, 0),
-                    esp32_arduino=cv.Version(0, 0, 0),
-                    esp8266_arduino=cv.Version(0, 0, 0),
-                    host=cv.Version(0, 0, 0),
-                    rp2_arduino=cv.Version(0, 0, 0),
-                    nrf52_zephyr=cv.Version(0, 0, 0),
+CONFIG_SCHEMA = cv.All(
+    cv.Schema(
+        {
+            cv.GenerateID(): cv.declare_id(NetworkComponent),
+            cv.SplitDefault(
+                CONF_ENABLE_IPV6,
+                bk72xx=False,
+                esp32=False,
+                esp8266=False,
+                host=False,
+                rp2=False,
+                nrf52=True,
+            ): cv.All(
+                cv.boolean,
+                cv.Any(
+                    cv.require_framework_version(
+                        bk72xx_arduino=cv.Version(1, 7, 0),
+                        esp_idf=cv.Version(0, 0, 0),
+                        esp32_arduino=cv.Version(0, 0, 0),
+                        esp8266_arduino=cv.Version(0, 0, 0),
+                        host=cv.Version(0, 0, 0),
+                        rp2_arduino=cv.Version(0, 0, 0),
+                        nrf52_zephyr=cv.Version(0, 0, 0),
+                    ),
+                    cv.boolean_false,
                 ),
-                cv.boolean_false,
+                validate_ipv6,
             ),
-            validate_ipv6,
-        ),
-        cv.Optional(CONF_MIN_IPV6_ADDR_COUNT, default=0): cv.positive_int,
-        cv.Optional(CONF_ENABLE_HIGH_PERFORMANCE): cv.All(cv.boolean, cv.only_on_esp32),
-    }
+            cv.Optional(CONF_MIN_IPV6_ADDR_COUNT, default=0): cv.positive_int,
+            cv.Optional(CONF_ENABLE_HIGH_PERFORMANCE): cv.All(
+                cv.boolean, cv.only_on_esp32
+            ),
+        }
+    ),
+    _register_provisioning_source,
 )
 
 
diff --git a/esphome/components/provisioning/__init__.py b/esphome/components/provisioning/__init__.py
new file mode 100644
index 0000000000..36fa69357a
--- /dev/null
+++ b/esphome/components/provisioning/__init__.py
@@ -0,0 +1,104 @@
+from dataclasses import dataclass, field
+import logging
+
+from esphome import automation
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.const import CONF_ID, CONF_ON_TIMEOUT, CONF_TIMEOUT
+from esphome.core import CORE
+from esphome.types import ConfigType
+
+CODEOWNERS = ["@esphome/core"]
+DOMAIN = "provisioning"
+
+_LOGGER = logging.getLogger(__name__)
+
+provisioning_ns = cg.esphome_ns.namespace("provisioning")
+ProvisioningManager = provisioning_ns.class_("ProvisioningManager", cg.Component)
+
+
+@dataclass
+class ProvisioningData:
+    # Names of the components that registered as a provisioning source this run.
+    sources: set[str] = field(default_factory=set)
+    # Names of source components that have their credentials set in the config.
+    hardcoded_credentials: set[str] = field(default_factory=set)
+
+
+def _get_data() -> ProvisioningData:
+    if DOMAIN not in CORE.data:
+        CORE.data[DOMAIN] = ProvisioningData()
+    return CORE.data[DOMAIN]
+
+
+def register_source(name: str) -> None:
+    """Record that ``name`` is a provisioning source for this configuration.
+
+    A provisioning-capable component (a transport that boots unprovisioned and is
+    set up by the controller on first connection, or a network interface that
+    provisions once connected) calls this while its own config is being processed,
+    typically from a schema validator. `provisioning:` then confirms at least one
+    source is present without inspecting the full config or knowing about any
+    specific component. State lives in CORE.data, which is cleared between runs.
+    """
+    _get_data().sources.add(name)
+
+
+def report_hardcoded_credentials(name: str) -> None:
+    """Record that source component ``name`` has its credentials set in the config.
+
+    A source component calls this from its own validator when it finds baked-in
+    credentials (a WiFi SSID/password, an API encryption key, ...). `provisioning:`
+    warns about these, since a device that ships with credentials does not need a
+    provisioning window. The warning is emitted here, by `provisioning:`, so the
+    source components stay unaware of it.
+    """
+    _get_data().hardcoded_credentials.add(name)
+
+
+CONFIG_SCHEMA = cv.Schema(
+    {
+        cv.GenerateID(): cv.declare_id(ProvisioningManager),
+        cv.Required(CONF_TIMEOUT): cv.All(
+            cv.positive_not_null_time_period, cv.positive_time_period_milliseconds
+        ),
+        cv.Optional(CONF_ON_TIMEOUT): automation.validate_automation(single=True),
+    }
+).extend(cv.COMPONENT_SCHEMA)
+
+
+def _final_validate(config: ConfigType) -> ConfigType:
+    """Validate the provisioning setup once every component has been processed.
+
+    Sources register during their own config validation, so by final validation
+    both the source set and the hardcoded-credentials set are complete.
+    """
+    data = _get_data()
+    if not data.sources:
+        raise cv.Invalid(
+            "'provisioning' requires at least one provisioning-capable component: "
+            "configure a network interface such as 'wifi:' or 'ethernet:', or enable "
+            "'api:' with 'encryption:' and no 'key:' so the device boots "
+            "unprovisioned and is configured on first connection."
+        )
+    if data.hardcoded_credentials:
+        _LOGGER.warning(
+            "'provisioning' is configured, but credentials are set in the "
+            "configuration for: %s. A device that uses a provisioning window should "
+            "ship without credentials so they are set on first connection; "
+            "hardcoding them makes the window pointless.",
+            ", ".join(sorted(data.hardcoded_credentials)),
+        )
+    return config
+
+
+FINAL_VALIDATE_SCHEMA = _final_validate
+
+
+async def to_code(config: ConfigType) -> None:
+    cg.add_define("USE_PROVISIONING")
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    cg.add(var.set_timeout(config[CONF_TIMEOUT]))
+    if on_timeout := config.get(CONF_ON_TIMEOUT):
+        await automation.build_automation(var.get_timeout_trigger(), [], on_timeout)
diff --git a/esphome/components/provisioning/provisioning.cpp b/esphome/components/provisioning/provisioning.cpp
new file mode 100644
index 0000000000..02c089bfed
--- /dev/null
+++ b/esphome/components/provisioning/provisioning.cpp
@@ -0,0 +1,92 @@
+#include "esphome/components/provisioning/provisioning.h"
+#ifdef USE_PROVISIONING
+#include "esphome/core/application.h"
+#include "esphome/core/log.h"
+#ifdef USE_NETWORK
+#include "esphome/components/network/util.h"
+#endif
+
+#include <cinttypes>
+
+namespace esphome::provisioning {
+
+static const char *const TAG = "provisioning";
+
+ProvisioningManager *global_provisioning_manager =  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+    nullptr;
+
+ProvisioningManager::ProvisioningManager() {
+  global_provisioning_manager = this;
+#ifdef USE_NETWORK
+  // Network connectivity is a built-in provisioning source. Registered here rather
+  // than from a source's setup() because connectivity is universal, not a pluggable
+  // transport; loop() latches it provisioned once the device has connected.
+  this->network_source_ = this->register_source();
+#endif
+}
+
+uint8_t ProvisioningManager::register_source() {
+  if (this->source_count_ >= MAX_SOURCES) {
+    // Defensive: only a handful of sources exist in practice. Fail loudly rather
+    // than shifting past the mask width (undefined behavior). The returned index is
+    // ignored by set_source_provisioned()'s bounds check.
+    ESP_LOGE(TAG, "Too many provisioning sources (max %u)", MAX_SOURCES);
+    return this->source_count_;
+  }
+  uint8_t source = this->source_count_++;
+  this->registered_mask_ |= (1UL << source);
+  return source;
+}
+
+void ProvisioningManager::loop() {
+  // Sources register during their own setup() (at various priorities), and this
+  // loop() also runs while waiting on a slow component during setup. Evaluating the
+  // provisioning state before every source has registered could conclude
+  // "provisioned" prematurely and disable_loop() for good, defeating the window --
+  // so do nothing until all setup() calls are done.
+  if (!App.is_setup_complete())
+    return;
+
+#ifdef USE_NETWORK
+  // Latch the built-in connectivity source once the device has been reachable via
+  // any interface. network::is_connected() aggregates wifi/ethernet/modem/... (OR
+  // across interfaces), and a disabled interface never connects so it never
+  // contributes. Latched: a later link drop does not un-provision -- the RAM-only
+  // window still reopens only on reboot.
+  if ((this->provisioned_mask_ & (1UL << this->network_source_)) == 0 && network::is_connected())
+    this->set_source_provisioned(this->network_source_, true);
+#endif
+
+  // The window is resolved once the device is provisioned or the window has closed;
+  // there is nothing left to track, so stop running entirely. Config validation
+  // guarantees at least one source, so is_provisioned() is never vacuously true here.
+  if (this->closed_ || this->is_provisioned()) {
+    this->disable_loop();
+    return;
+  }
+  // The window timer runs from boot (millis since boot). The closed state is not
+  // persisted, so a reboot reopens the window.
+  if (this->timeout_ != 0 && App.get_loop_component_start_time() > this->timeout_) {
+    this->close_window_();
+  }
+}
+
+void ProvisioningManager::close_window_() {
+  this->closed_ = true;
+  ESP_LOGW(TAG, "Window expired; cycle power to reopen window");
+  // Notify internal consumers first (transports disconnect clients, Improv stops),
+  // then fire the user-facing automation.
+  this->closed_callback_.call();
+  this->timeout_trigger_.trigger();
+}
+
+void ProvisioningManager::dump_config() {
+  ESP_LOGCONFIG(TAG,
+                "Provisioning:\n"
+                "  Timeout: %" PRIu32 "ms\n"
+                "  Provisioned: %s",
+                this->timeout_, YESNO(this->is_provisioned()));
+}
+
+}  // namespace esphome::provisioning
+#endif  // USE_PROVISIONING
diff --git a/esphome/components/provisioning/provisioning.h b/esphome/components/provisioning/provisioning.h
new file mode 100644
index 0000000000..e21b8f3ef0
--- /dev/null
+++ b/esphome/components/provisioning/provisioning.h
@@ -0,0 +1,96 @@
+#pragma once
+
+#include "esphome/core/defines.h"
+#ifdef USE_PROVISIONING
+#include "esphome/core/automation.h"
+#include "esphome/core/component.h"
+#include "esphome/core/helpers.h"
+
+#include <cstdint>
+
+namespace esphome::provisioning {
+
+// Central provisioning-window manager (EN18031). A device that ships unprovisioned
+// (secure transports enabled with no credentials, configured by the controller on
+// first connection) opens a provisioning window at boot. Each transport that needs
+// provisioning registers as a "source" and reports its state; the device is
+// considered provisioned once every registered source is provisioned.
+//
+// Network connectivity is a built-in source: a device with a network interface but
+// no other provisioning-capable component (no api encryption, etc.) is still
+// considered provisioned once it has connected via any interface -- so an
+// Improv-only device reports its state correctly.
+//
+// If the window times out while still unprovisioned it closes: the closed state is
+// RAM-only (a power cycle / reset reopens it) and the `on_timeout` automation fires.
+// Components query window_pending()/closed() to suppress reboot timeouts and refuse
+// further provisioning. This manager owns no transport knowledge; transports
+// (api, and later mqtt/wireguard/...) drive it through the source API.
+class ProvisioningManager : public Component {
+ public:
+  // Maximum number of provisioning sources, limited by the width of the state masks.
+  static constexpr uint8_t MAX_SOURCES = 32;
+
+  ProvisioningManager();
+
+  void loop() override;
+  void dump_config() override;
+  float get_setup_priority() const override { return setup_priority::BEFORE_CONNECTION; }
+
+  void set_timeout(uint32_t timeout) { this->timeout_ = timeout; }
+
+  // Register a provisioning source. Returns a bit index the source uses to report
+  // its state via set_source_provisioned(). Call once, from the source's setup().
+  uint8_t register_source();
+  // Report whether the given source currently holds valid credentials.
+  void set_source_provisioned(uint8_t source, bool provisioned) {
+    if (source >= MAX_SOURCES)
+      return;
+    if (provisioned) {
+      this->provisioned_mask_ |= (1UL << source);
+    } else {
+      this->provisioned_mask_ &= ~(1UL << source);
+    }
+  }
+
+  // True once every registered source is provisioned. Config validation guarantees
+  // at least one source, and the built-in connectivity source registers in the
+  // constructor, so registered_mask_ is never zero in practice.
+  bool is_provisioned() const { return (this->provisioned_mask_ & this->registered_mask_) == this->registered_mask_; }
+  // True while provisioning is still pending: the device is unprovisioned, whether
+  // the window is still open or has already closed. Reboot timeouts are suppressed
+  // while this holds so the device never auto-reboots (and silently reopens the
+  // window) while unprovisioned.
+  bool window_pending() const { return !this->is_provisioned(); }
+  // True once the window has expired without the device being provisioned.
+  bool closed() const { return this->closed_; }
+
+  // Register a callback fired once when the window closes (runtime expiry). Used
+  // internally by transports/Improv to stop accepting provisioning. The user-facing
+  // on_timeout automation is wired to get_timeout_trigger() instead.
+  template<typename F> void add_on_closed_callback(F &&callback) {
+    this->closed_callback_.add(std::forward<F>(callback));
+  }
+  Trigger<> *get_timeout_trigger() { return &this->timeout_trigger_; }
+
+ protected:
+  void close_window_();
+
+  Trigger<> timeout_trigger_;
+  LazyCallbackManager<void()> closed_callback_;
+  uint32_t timeout_{0};
+  uint32_t registered_mask_{0};
+  uint32_t provisioned_mask_{0};
+  uint8_t source_count_{0};
+  bool closed_{false};
+#ifdef USE_NETWORK
+  // Built-in connectivity source (see loop()): registered in the constructor and
+  // latched provisioned once the device has connected via any network interface.
+  uint8_t network_source_{0};
+#endif
+};
+
+extern ProvisioningManager *global_provisioning_manager;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+
+}  // namespace esphome::provisioning
+#endif  // USE_PROVISIONING
diff --git a/esphome/components/wifi/__init__.py b/esphome/components/wifi/__init__.py
index dc5c8be4d7..137304c807 100644
--- a/esphome/components/wifi/__init__.py
+++ b/esphome/components/wifi/__init__.py
@@ -436,6 +436,21 @@ def _validate(config):
     return config
 
 
+def _report_provisioning_credentials(config):
+    """Report baked-in STA credentials to the provisioning component (if used).
+
+    `_validate` has already folded any ``ssid``/``password`` into ``networks``, so a
+    non-empty list means credentials are set in the config. `provisioning:` warns
+    about this, since a device that uses a provisioning window should get its
+    credentials on first connection instead.
+    """
+    if config.get(CONF_NETWORKS):
+        from esphome.components import provisioning
+
+        provisioning.report_hardcoded_credentials("wifi")
+    return config
+
+
 CONF_PASSIVE_SCAN = "passive_scan"
 
 FAST_CONNECT_SCHEMA = cv.Schema(
@@ -517,6 +532,7 @@ CONFIG_SCHEMA = cv.All(
     ),
     _apply_min_auth_mode_default,
     _validate,
+    _report_provisioning_credentials,
 )
 
 
diff --git a/esphome/components/wifi/wifi_component.cpp b/esphome/components/wifi/wifi_component.cpp
index c951e74358..44e3cb6af9 100644
--- a/esphome/components/wifi/wifi_component.cpp
+++ b/esphome/components/wifi/wifi_component.cpp
@@ -45,6 +45,10 @@
 #include "esphome/components/improv_serial/improv_serial_component.h"
 #endif
 
+#ifdef USE_PROVISIONING
+#include "esphome/components/provisioning/provisioning.h"
+#endif
+
 namespace esphome::wifi {
 
 static const char *const TAG = "wifi";
@@ -872,8 +876,20 @@ void WiFiComponent::loop() {
 
     if (!this->has_ap() && this->reboot_timeout_ != 0) {
       if (now - this->last_connected_ > this->reboot_timeout_) {
-        ESP_LOGE(TAG, "Can't connect; rebooting");
-        App.reboot();
+        bool suppress = false;
+#ifdef USE_PROVISIONING
+        // Don't reboot while a provisioning window is pending (device unprovisioned).
+        // The device is legitimately waiting to be onboarded (Wi-Fi must come up
+        // before the controller can set credentials), and an auto-reboot would reopen
+        // the window without the deliberate power cycle / reset that is meant to be
+        // required. Resumes normal reboot behavior once provisioned.
+        suppress = provisioning::global_provisioning_manager != nullptr &&
+                   provisioning::global_provisioning_manager->window_pending();
+#endif
+        if (!suppress) {
+          ESP_LOGE(TAG, "Can't connect; rebooting");
+          App.reboot();
+        }
       }
     }
   }
diff --git a/esphome/core/defines.h b/esphome/core/defines.h
index 1d09bb5c5c..639508a7b2 100644
--- a/esphome/core/defines.h
+++ b/esphome/core/defines.h
@@ -153,6 +153,7 @@
 #define USE_OUTPUT_FLOAT_POWER_SCALING
 #define USE_POWER_SUPPLY
 #define USE_PREFERENCES_SYNC_EVERY_LOOP
+#define USE_PROVISIONING
 #define USE_QR_CODE
 #define USE_SAFE_MODE_CALLBACK
 #define ESPHOME_SAFE_MODE_CALLBACK_COUNT 1
diff --git a/tests/component_tests/provisioning/test_provisioning.py b/tests/component_tests/provisioning/test_provisioning.py
new file mode 100644
index 0000000000..07f5065241
--- /dev/null
+++ b/tests/component_tests/provisioning/test_provisioning.py
@@ -0,0 +1,84 @@
+"""Tests for the provisioning component config validation."""
+
+from __future__ import annotations
+
+import logging
+
+import pytest
+
+from esphome import config_validation as cv
+from esphome.components.provisioning import (
+    CONFIG_SCHEMA,
+    FINAL_VALIDATE_SCHEMA,
+    register_source,
+    report_hardcoded_credentials,
+)
+from esphome.const import CONF_TIMEOUT, PlatformFramework
+from tests.component_tests.types import SetCoreConfigCallable
+
+
+def test_provisioning_requires_a_source(
+    set_core_config: SetCoreConfigCallable,
+) -> None:
+    """Provisioning with no registered source is a config error.
+
+    Sources register themselves during their own config validation; with none
+    registered the window could never resolve, so validation fails.
+    """
+    set_core_config(PlatformFramework.ESP32_IDF)
+    with pytest.raises(cv.Invalid, match="provisioning-capable component"):
+        FINAL_VALIDATE_SCHEMA({})
+
+
+def test_provisioning_accepts_a_registered_source(
+    set_core_config: SetCoreConfigCallable,
+) -> None:
+    """A component that registered as a provisioning source satisfies validation."""
+    set_core_config(PlatformFramework.ESP32_IDF)
+    register_source("network")
+    # Should not raise.
+    assert FINAL_VALIDATE_SCHEMA({}) == {}
+
+
+def test_provisioning_warns_on_hardcoded_credentials(
+    set_core_config: SetCoreConfigCallable,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """A source with credentials set in the config triggers a warning."""
+    set_core_config(PlatformFramework.ESP32_IDF)
+    register_source("network")
+    report_hardcoded_credentials("wifi")
+    with caplog.at_level(logging.WARNING):
+        assert FINAL_VALIDATE_SCHEMA({}) == {}
+    assert "wifi" in caplog.text
+    assert "credentials" in caplog.text
+
+
+def test_provisioning_no_warning_without_hardcoded_credentials(
+    set_core_config: SetCoreConfigCallable,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """No credentials warning when no source reports hardcoded credentials."""
+    set_core_config(PlatformFramework.ESP32_IDF)
+    register_source("network")
+    with caplog.at_level(logging.WARNING):
+        assert FINAL_VALIDATE_SCHEMA({}) == {}
+    assert "credentials" not in caplog.text
+
+
+def test_provisioning_rejects_zero_timeout(
+    set_core_config: SetCoreConfigCallable,
+) -> None:
+    """A zero timeout would leave the window open forever, so it is rejected."""
+    set_core_config(PlatformFramework.ESP32_IDF)
+    with pytest.raises(cv.Invalid):
+        CONFIG_SCHEMA({CONF_TIMEOUT: "0s"})
+
+
+def test_provisioning_accepts_positive_timeout(
+    set_core_config: SetCoreConfigCallable,
+) -> None:
+    """A positive timeout is accepted."""
+    set_core_config(PlatformFramework.ESP32_IDF)
+    config = CONFIG_SCHEMA({CONF_TIMEOUT: "5min"})
+    assert config[CONF_TIMEOUT].total_milliseconds == 300000
diff --git a/tests/components/provisioning/test.esp32-idf.yaml b/tests/components/provisioning/test.esp32-idf.yaml
new file mode 100644
index 0000000000..24168881fc
--- /dev/null
+++ b/tests/components/provisioning/test.esp32-idf.yaml
@@ -0,0 +1,25 @@
+# Exercises the provisioning window: api registers as a provisioning source
+# (encryption enabled, no key), the on_timeout automation, and the wifi +
+# esp32_improv cross-component guards. improv_serial is intentionally NOT gated.
+provisioning:
+  timeout: 1min
+  on_timeout:
+    then:
+      - logger.log: "Provisioning window expired"
+
+api:
+  encryption:
+
+wifi:
+  ssid: MySSID
+  password: password1
+
+improv_serial:
+
+binary_sensor:
+  - platform: gpio
+    pin: 0
+    id: io0_button
+
+esp32_improv:
+  authorizer: io0_button
diff --git a/tests/components/provisioning/test.esp8266-ard.yaml b/tests/components/provisioning/test.esp8266-ard.yaml
new file mode 100644
index 0000000000..4188c00bef
--- /dev/null
+++ b/tests/components/provisioning/test.esp8266-ard.yaml
@@ -0,0 +1,16 @@
+# Provisioning window on ESP8266 (no BLE Improv): api as a provisioning source
+# and the wifi reboot guard. improv_serial is present and intentionally NOT gated.
+provisioning:
+  timeout: 1min
+  on_timeout:
+    then:
+      - logger.log: "Provisioning window expired"
+
+api:
+  encryption:
+
+wifi:
+  ssid: MySSID
+  password: password1
+
+improv_serial:
diff --git a/tests/components/provisioning/validate.esp32-idf.yaml b/tests/components/provisioning/validate.esp32-idf.yaml
new file mode 100644
index 0000000000..1fd3d67882
--- /dev/null
+++ b/tests/components/provisioning/validate.esp32-idf.yaml
@@ -0,0 +1,15 @@
+# A device provisioned over the network (wifi / Improv) with no api: network
+# connectivity alone satisfies provisioning, so `provisioning:` is valid without an
+# api encryption source. Config-only -- exercises the network provisioning-source
+# validation path (the Improv-only case from the review).
+provisioning:
+  timeout: 1min
+  on_timeout:
+    then:
+      - logger.log: "Provisioning window expired"
+
+wifi:
+  ssid: MySSID
+  password: password1
+
+improv_serial: