diff --git a/homeassistant/components/sunricher_dali/__init__.py b/homeassistant/components/sunricher_dali/__init__.py
index 47d4317ce97..2137480cea8 100644
--- a/homeassistant/components/sunricher_dali/__init__.py
+++ b/homeassistant/components/sunricher_dali/__init__.py
@@ -3,9 +3,10 @@
 from __future__ import annotations
 
 import asyncio
+from collections.abc import Sequence
 import logging
 
-from PySrDaliGateway import DaliGateway
+from PySrDaliGateway import DaliGateway, Device
 from PySrDaliGateway.exceptions import DaliGatewayError
 
 from homeassistant.const import (
@@ -28,6 +29,38 @@ _PLATFORMS: list[Platform] = [Platform.LIGHT, Platform.SCENE]
 _LOGGER = logging.getLogger(__name__)
 
 
+def _remove_missing_devices(
+    hass: HomeAssistant,
+    entry: DaliCenterConfigEntry,
+    devices: Sequence[Device],
+    gateway_identifier: tuple[str, str],
+) -> None:
+    """Detach devices that are no longer provided by the gateway."""
+    device_registry = dr.async_get(hass)
+    known_device_ids = {device.dev_id for device in devices}
+
+    for device_entry in dr.async_entries_for_config_entry(
+        device_registry, entry.entry_id
+    ):
+        if gateway_identifier in device_entry.identifiers:
+            continue
+
+        domain_device_ids = {
+            identifier[1]
+            for identifier in device_entry.identifiers
+            if identifier[0] == DOMAIN
+        }
+
+        if not domain_device_ids:
+            continue
+
+        if domain_device_ids.isdisjoint(known_device_ids):
+            device_registry.async_update_device(
+                device_entry.id,
+                remove_config_entry_id=entry.entry_id,
+            )
+
+
 async def async_setup_entry(hass: HomeAssistant, entry: DaliCenterConfigEntry) -> bool:
     """Set up Sunricher DALI from a config entry."""
 
@@ -70,6 +103,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: DaliCenterConfigEntry) -
         model="SR-GW-EDA",
         serial_number=gw_sn,
     )
+    _remove_missing_devices(hass, entry, devices, (DOMAIN, gw_sn))
 
     entry.runtime_data = DaliCenterData(
         gateway=gateway,
diff --git a/tests/components/sunricher_dali/test_init.py b/tests/components/sunricher_dali/test_init.py
index 1941b6313d8..2dd7db20996 100644
--- a/tests/components/sunricher_dali/test_init.py
+++ b/tests/components/sunricher_dali/test_init.py
@@ -5,9 +5,10 @@ from unittest.mock import MagicMock
 from PySrDaliGateway.exceptions import DaliGatewayError
 from syrupy.assertion import SnapshotAssertion
 
+from homeassistant.components.sunricher_dali.const import DOMAIN
 from homeassistant.config_entries import ConfigEntryState
 from homeassistant.core import HomeAssistant
-import homeassistant.helpers.device_registry as dr
+from homeassistant.helpers import device_registry as dr
 
 from tests.common import MockConfigEntry
 
@@ -63,6 +64,23 @@ async def test_setup_entry_connection_error(
     mock_gateway.connect.assert_called_once()
 
 
+async def test_setup_entry_discovery_error(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_gateway: MagicMock,
+) -> None:
+    """Test setup fails when device discovery fails."""
+    mock_config_entry.add_to_hass(hass)
+    mock_gateway.discover_devices.side_effect = DaliGatewayError("Discovery failed")
+
+    assert not await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.SETUP_RETRY
+    mock_gateway.connect.assert_called_once()
+    mock_gateway.discover_devices.assert_called_once()
+
+
 async def test_unload_entry(
     hass: HomeAssistant,
     mock_config_entry: MockConfigEntry,
@@ -80,3 +98,40 @@ async def test_unload_entry(
     await hass.async_block_till_done()
 
     assert mock_config_entry.state is ConfigEntryState.NOT_LOADED
+
+
+async def test_remove_stale_devices(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_gateway: MagicMock,
+    mock_devices: list[MagicMock],
+    device_registry: dr.DeviceRegistry,
+) -> None:
+    """Test stale devices are removed when device list decreases."""
+    mock_config_entry.add_to_hass(hass)
+    assert await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    devices_before = dr.async_entries_for_config_entry(
+        device_registry, mock_config_entry.entry_id
+    )
+    initial_count = len(devices_before)
+
+    assert await hass.config_entries.async_unload(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    mock_gateway.discover_devices.return_value = mock_devices[:2]
+
+    assert await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    devices_after = dr.async_entries_for_config_entry(
+        device_registry, mock_config_entry.entry_id
+    )
+    assert len(devices_after) < initial_count
+
+    gateway_device = device_registry.async_get_device(
+        identifiers={(DOMAIN, mock_gateway.gw_sn)}
+    )
+    assert gateway_device is not None
+    assert mock_config_entry.entry_id in gateway_device.config_entries