diff --git a/esphome/components/zephyr_mcumgr/ota/__init__.py b/esphome/components/zephyr_mcumgr/ota/__init__.py
index d4f84e30f2..ed7069a540 100644
--- a/esphome/components/zephyr_mcumgr/ota/__init__.py
+++ b/esphome/components/zephyr_mcumgr/ota/__init__.py
@@ -147,14 +147,15 @@ async def to_code(config: ConfigType) -> None:
     zephyr_add_prj_conf("MCUMGR_MGMT_NOTIFICATION_HOOKS", True)
     zephyr_add_prj_conf("MCUMGR_GRP_IMG_STATUS_HOOKS", True)
     zephyr_add_prj_conf("MCUMGR_GRP_IMG_UPLOAD_CHECK_HOOK", True)
+    # OS management group (reset, MCUMGR_PARAMETERS query, etc.) isn't transport-specific --
+    # every mcumgr transport needs it, not just BLE.
+    zephyr_add_prj_conf("MCUMGR_GRP_OS", True)
+    zephyr_add_prj_conf("MCUMGR_GRP_OS_MCUMGR_PARAMS", True)
     transport = config[CONF_TRANSPORT]
     if transport[CONF_BLE]:
         zephyr_add_prj_conf("MCUMGR_TRANSPORT_BT", True)
         zephyr_add_prj_conf("MCUMGR_TRANSPORT_BT_REASSEMBLY", True)
 
-        zephyr_add_prj_conf("MCUMGR_GRP_OS", True)
-        zephyr_add_prj_conf("MCUMGR_GRP_OS_MCUMGR_PARAMS", True)
-
         zephyr_add_prj_conf("NCS_SAMPLE_MCUMGR_BT_OTA_DFU_SPEEDUP", True)
         request_ble_l2cap_mtu(498)  # matches NCS_SAMPLE_MCUMGR_BT_OTA_DFU_SPEEDUP
     if CONF_HARDWARE_UART in transport: