diff --git a/esphome/components/esp32/gpio.h b/esphome/components/esp32/gpio.h
index 565e276ea8..ecd464edb6 100644
--- a/esphome/components/esp32/gpio.h
+++ b/esphome/components/esp32/gpio.h
@@ -40,13 +40,13 @@ class ESP32InternalGPIOPin : public InternalGPIOPin {
   // - 3 bytes for members below
   // - 1 byte padding for alignment
   // - 4 bytes for vtable pointer
-  uint8_t pin_;        // GPIO pin number (0-255, actual max ~54 on ESP32)
-  gpio::Flags flags_;  // GPIO flags (1 byte)
+  uint8_t pin_{};        // GPIO pin number (0-255, actual max ~54 on ESP32)
+  gpio::Flags flags_{};  // GPIO flags (1 byte)
   struct PinFlags {
     uint8_t inverted : 1;        // Invert pin logic (1 bit)
     uint8_t drive_strength : 2;  // Drive strength 0-3 (2 bits)
     uint8_t reserved : 5;        // Reserved for future use (5 bits)
-  } pin_flags_;                  // Total: 1 byte
+  } pin_flags_{};                // Total: 1 byte
   // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
   static bool isr_service_installed;
 };
diff --git a/esphome/components/esp8266/gpio.h b/esphome/components/esp8266/gpio.h
index dd6407885e..230fed9569 100644
--- a/esphome/components/esp8266/gpio.h
+++ b/esphome/components/esp8266/gpio.h
@@ -28,9 +28,9 @@ class ESP8266GPIOPin : public InternalGPIOPin {
  protected:
   void attach_interrupt(void (*func)(void *), void *arg, gpio::InterruptType type) const override;
 
-  uint8_t pin_;
-  bool inverted_;
-  gpio::Flags flags_;
+  uint8_t pin_{};
+  bool inverted_{};
+  gpio::Flags flags_{};
 };
 
 }  // namespace esp8266
diff --git a/esphome/components/host/gpio.h b/esphome/components/host/gpio.h
index a60d535912..3a6670926d 100644
--- a/esphome/components/host/gpio.h
+++ b/esphome/components/host/gpio.h
@@ -27,9 +27,9 @@ class HostGPIOPin : public InternalGPIOPin {
  protected:
   void attach_interrupt(void (*func)(void *), void *arg, gpio::InterruptType type) const override;
 
-  uint8_t pin_;
-  bool inverted_;
-  gpio::Flags flags_;
+  uint8_t pin_{};
+  bool inverted_{};
+  gpio::Flags flags_{};
 };
 
 }  // namespace host
diff --git a/esphome/components/libretiny/gpio_arduino.h b/esphome/components/libretiny/gpio_arduino.h
index 9adc425a41..9838718b00 100644
--- a/esphome/components/libretiny/gpio_arduino.h
+++ b/esphome/components/libretiny/gpio_arduino.h
@@ -26,9 +26,9 @@ class ArduinoInternalGPIOPin : public InternalGPIOPin {
  protected:
   void attach_interrupt(void (*func)(void *), void *arg, gpio::InterruptType type) const override;
 
-  uint8_t pin_;
-  bool inverted_;
-  gpio::Flags flags_;
+  uint8_t pin_{};
+  bool inverted_{};
+  gpio::Flags flags_{};
 };
 
 }  // namespace libretiny
diff --git a/esphome/components/rp2040/gpio.h b/esphome/components/rp2040/gpio.h
index 9bc66d9e4b..0f067d03ce 100644
--- a/esphome/components/rp2040/gpio.h
+++ b/esphome/components/rp2040/gpio.h
@@ -28,9 +28,9 @@ class RP2040GPIOPin : public InternalGPIOPin {
  protected:
   void attach_interrupt(void (*func)(void *), void *arg, gpio::InterruptType type) const override;
 
-  uint8_t pin_;
-  bool inverted_;
-  gpio::Flags flags_;
+  uint8_t pin_{};
+  bool inverted_{};
+  gpio::Flags flags_{};
 };
 
 }  // namespace rp2040
diff --git a/esphome/components/zephyr/gpio.h b/esphome/components/zephyr/gpio.h
index f512ae4648..9d0aa6b080 100644
--- a/esphome/components/zephyr/gpio.h
+++ b/esphome/components/zephyr/gpio.h
@@ -25,11 +25,11 @@ class ZephyrGPIOPin : public InternalGPIOPin {
 
  protected:
   void attach_interrupt(void (*func)(void *), void *arg, gpio::InterruptType type) const override;
-  uint8_t pin_;
-  bool inverted_;
-  gpio::Flags flags_;
-  const device *gpio_ = nullptr;
-  bool value_ = false;
+  uint8_t pin_{};
+  bool inverted_{};
+  gpio::Flags flags_{};
+  const device *gpio_{nullptr};
+  bool value_{false};
 };
 
 }  // namespace zephyr