diff --git a/homeassistant/components/smlight/diagnostics.py b/homeassistant/components/smlight/diagnostics.py
new file mode 100644
index 00000000000..d303e5803bb
--- /dev/null
+++ b/homeassistant/components/smlight/diagnostics.py
@@ -0,0 +1,25 @@
+"""Collect diagnostics for SMLIGHT devices."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from pysmlight.const import Actions
+
+from homeassistant.core import HomeAssistant
+
+from . import SmConfigEntry
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: SmConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordintator = config_entry.runtime_data.data
+    info = await coordintator.client.get_info()
+    log = await coordintator.client.get({"action": Actions.API_GET_LOG.value}) or "none"
+
+    return {
+        "info": info.to_dict(),
+        "log": log.split("\n"),
+    }
diff --git a/tests/components/smlight/fixtures/logs.txt b/tests/components/smlight/fixtures/logs.txt
new file mode 100644
index 00000000000..f04dc881514
--- /dev/null
+++ b/tests/components/smlight/fixtures/logs.txt
@@ -0,0 +1 @@
+[04:28:51] setup | Starting firmware: v2.3.6\n[04:28:52] ConfigHelper | LittleFS mounted\n[04:28:52] ConfigHelper | load config\n[04:28:52] ConfigHelper | config open: Ok\n[04:28:52] setup | Config loaded\n[04:28:52] setup | Reboot reason: 3\n[04:28:52] setup | Coordinator mode: LAN\n[04:28:52] setup | Device type: SLZB-06P10\n[04:28:52] setup | Radio mode: \"ZB COORD\" Radio FW version: 20240716 Radio FW CH: PROD\n[04:28:52] Network | init\n[04:28:52] L_Y,L_B | status: 1\n[04:28:54] Network | EVENT_ETH_START\n[04:28:54] Network | EVENT_ETH_CONNECTED\n[04:28:54] Network | [MDNS] Started\n[04:28:54] Network | EVENT_ETH_GOT_IP\n[04:28:54] Network | ETH MAC: AA:BB:CC:DD:EE:FF IPv4: 192.168.0.11 GW: 192.168.0.1 Speed: 100Mbps DNS1: 192.168.0.1 DNS2: 0.0.0.0\n[04:28:54] Network | fireNetworkUp\n[04:28:54] taskZB | Waiting for zbChk\n[04:28:54] Web | Webserver started
\ No newline at end of file
diff --git a/tests/components/smlight/snapshots/test_diagnostics.ambr b/tests/components/smlight/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..97177de1704
--- /dev/null
+++ b/tests/components/smlight/snapshots/test_diagnostics.ambr
@@ -0,0 +1,27 @@
+# serializer version: 1
+# name: test_entry_diagnostics
+  dict({
+    'info': dict({
+      'MAC': 'AA:BB:CC:DD:EE:FF',
+      'coord_mode': 0,
+      'device_ip': '192.168.1.161',
+      'fs_total': 3456,
+      'fw_channel': 'dev',
+      'hostname': 'SLZB-06p7',
+      'legacy_api': 0,
+      'model': 'SLZB-06p7',
+      'ram_total': 296,
+      'sw_version': 'v2.3.6',
+      'wifi_mode': 0,
+      'zb_channel': 0,
+      'zb_flash_size': 704,
+      'zb_hw': 'CC2652P7',
+      'zb_ram_size': 152,
+      'zb_type': 0,
+      'zb_version': '20240314',
+    }),
+    'log': list([
+      '[04:28:51] setup | Starting firmware: v2.3.6\\n[04:28:52] ConfigHelper | LittleFS mounted\\n[04:28:52] ConfigHelper | load config\\n[04:28:52] ConfigHelper | config open: Ok\\n[04:28:52] setup | Config loaded\\n[04:28:52] setup | Reboot reason: 3\\n[04:28:52] setup | Coordinator mode: LAN\\n[04:28:52] setup | Device type: SLZB-06P10\\n[04:28:52] setup | Radio mode: \\"ZB COORD\\" Radio FW version: 20240716 Radio FW CH: PROD\\n[04:28:52] Network | init\\n[04:28:52] L_Y,L_B | status: 1\\n[04:28:54] Network | EVENT_ETH_START\\n[04:28:54] Network | EVENT_ETH_CONNECTED\\n[04:28:54] Network | [MDNS] Started\\n[04:28:54] Network | EVENT_ETH_GOT_IP\\n[04:28:54] Network | ETH MAC: AA:BB:CC:DD:EE:FF IPv4: 192.168.0.11 GW: 192.168.0.1 Speed: 100Mbps DNS1: 192.168.0.1 DNS2: 0.0.0.0\\n[04:28:54] Network | fireNetworkUp\\n[04:28:54] taskZB | Waiting for zbChk\\n[04:28:54] Web | Webserver started',
+    ]),
+  })
+# ---
diff --git a/tests/components/smlight/test_diagnostics.py b/tests/components/smlight/test_diagnostics.py
new file mode 100644
index 00000000000..d0c756bfd87
--- /dev/null
+++ b/tests/components/smlight/test_diagnostics.py
@@ -0,0 +1,30 @@
+"""Test SMLIGHT diagnostics."""
+
+from unittest.mock import MagicMock
+
+from syrupy import SnapshotAssertion
+
+from homeassistant.components.smlight.const import DOMAIN
+from homeassistant.core import HomeAssistant
+
+from .conftest import setup_integration
+
+from tests.common import MockConfigEntry, load_fixture
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+async def test_entry_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    mock_config_entry: MockConfigEntry,
+    mock_smlight_client: MagicMock,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test config entry diagnostics."""
+    mock_smlight_client.get.return_value = load_fixture("logs.txt", DOMAIN)
+    entry = await setup_integration(hass, mock_config_entry)
+
+    result = await get_diagnostics_for_config_entry(hass, hass_client, entry)
+
+    assert result == snapshot