diff --git a/homeassistant/components/uptime_kuma/diagnostics.py b/homeassistant/components/uptime_kuma/diagnostics.py
new file mode 100644
index 00000000000..48e23adc40d
--- /dev/null
+++ b/homeassistant/components/uptime_kuma/diagnostics.py
@@ -0,0 +1,23 @@
+"""Diagnostics platform for Uptime Kuma."""
+
+from __future__ import annotations
+
+from dataclasses import asdict
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.core import HomeAssistant
+
+from .coordinator import UptimeKumaConfigEntry
+
+TO_REDACT = {"monitor_url", "monitor_hostname"}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: UptimeKumaConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+
+    return async_redact_data(
+        {k: asdict(v) for k, v in entry.runtime_data.data.items()}, TO_REDACT
+    )
diff --git a/homeassistant/components/uptime_kuma/quality_scale.yaml b/homeassistant/components/uptime_kuma/quality_scale.yaml
index c3d88f7e3c8..469ecad8d7b 100644
--- a/homeassistant/components/uptime_kuma/quality_scale.yaml
+++ b/homeassistant/components/uptime_kuma/quality_scale.yaml
@@ -43,7 +43,7 @@ rules:
 
   # Gold
   devices: done
-  diagnostics: todo
+  diagnostics: done
   discovery-update-info:
     status: exempt
     comment: is not locally discoverable
diff --git a/tests/components/uptime_kuma/snapshots/test_diagnostics.ambr b/tests/components/uptime_kuma/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..97e40e821da
--- /dev/null
+++ b/tests/components/uptime_kuma/snapshots/test_diagnostics.ambr
@@ -0,0 +1,41 @@
+# serializer version: 1
+# name: test_diagnostics
+  dict({
+    '1': dict({
+      'monitor_cert_days_remaining': 90,
+      'monitor_cert_is_valid': 1,
+      'monitor_hostname': None,
+      'monitor_id': 1,
+      'monitor_name': 'Monitor 1',
+      'monitor_port': None,
+      'monitor_response_time': 120,
+      'monitor_status': 1,
+      'monitor_type': 'http',
+      'monitor_url': '**REDACTED**',
+    }),
+    '2': dict({
+      'monitor_cert_days_remaining': 0,
+      'monitor_cert_is_valid': 0,
+      'monitor_hostname': None,
+      'monitor_id': 2,
+      'monitor_name': 'Monitor 2',
+      'monitor_port': None,
+      'monitor_response_time': 28,
+      'monitor_status': 1,
+      'monitor_type': 'port',
+      'monitor_url': None,
+    }),
+    '3': dict({
+      'monitor_cert_days_remaining': 90,
+      'monitor_cert_is_valid': 1,
+      'monitor_hostname': None,
+      'monitor_id': 3,
+      'monitor_name': 'Monitor 3',
+      'monitor_port': None,
+      'monitor_response_time': 120,
+      'monitor_status': 0,
+      'monitor_type': 'json-query',
+      'monitor_url': '**REDACTED**',
+    }),
+  })
+# ---
diff --git a/tests/components/uptime_kuma/test_diagnostics.py b/tests/components/uptime_kuma/test_diagnostics.py
new file mode 100644
index 00000000000..92d98d49b75
--- /dev/null
+++ b/tests/components/uptime_kuma/test_diagnostics.py
@@ -0,0 +1,28 @@
+"""Tests Uptime Kuma diagnostics platform."""
+
+import pytest
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+@pytest.mark.usefixtures("mock_pythonkuma")
+async def test_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    config_entry: MockConfigEntry,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test diagnostics."""
+
+    config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+    assert (
+        await get_diagnostics_for_config_entry(hass, hass_client, config_entry)
+        == snapshot
+    )