diff --git a/homeassistant/components/cookidoo/coordinator.py b/homeassistant/components/cookidoo/coordinator.py
index f99f58c2dd6..2ce61306afe 100644
--- a/homeassistant/components/cookidoo/coordinator.py
+++ b/homeassistant/components/cookidoo/coordinator.py
@@ -14,6 +14,7 @@ from cookidoo_api import (
     CookidooIngredientItem,
     CookidooRequestException,
     CookidooSubscription,
+    CookidooUserInfo,
 )
 
 from homeassistant.config_entries import ConfigEntry
@@ -42,6 +43,7 @@ class CookidooDataUpdateCoordinator(DataUpdateCoordinator[CookidooData]):
     """A Cookidoo Data Update Coordinator."""
 
     config_entry: CookidooConfigEntry
+    user: CookidooUserInfo
 
     def __init__(
         self, hass: HomeAssistant, cookidoo: Cookidoo, entry: CookidooConfigEntry
@@ -59,6 +61,7 @@ class CookidooDataUpdateCoordinator(DataUpdateCoordinator[CookidooData]):
     async def _async_setup(self) -> None:
         try:
             await self.cookidoo.login()
+            self.user = await self.cookidoo.get_user_info()
         except CookidooRequestException as e:
             raise UpdateFailed(
                 translation_domain=DOMAIN,
diff --git a/homeassistant/components/cookidoo/diagnostics.py b/homeassistant/components/cookidoo/diagnostics.py
new file mode 100644
index 00000000000..f981317df19
--- /dev/null
+++ b/homeassistant/components/cookidoo/diagnostics.py
@@ -0,0 +1,26 @@
+"""Diagnostics for the Cookidoo integration."""
+
+from dataclasses import asdict
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.const import CONF_PASSWORD
+from homeassistant.core import HomeAssistant
+
+from .coordinator import CookidooConfigEntry
+
+TO_REDACT = [
+    CONF_PASSWORD,
+]
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: CookidooConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+
+    return {
+        "entry_data": async_redact_data(entry.data, TO_REDACT),
+        "data": asdict(entry.runtime_data.data),
+        "user": asdict(entry.runtime_data.user),
+    }
diff --git a/homeassistant/components/cookidoo/quality_scale.yaml b/homeassistant/components/cookidoo/quality_scale.yaml
index 95a35829079..209f2ce5686 100644
--- a/homeassistant/components/cookidoo/quality_scale.yaml
+++ b/homeassistant/components/cookidoo/quality_scale.yaml
@@ -63,7 +63,7 @@ rules:
   stale-devices:
     status: exempt
     comment: No stale entities possible
-  diagnostics: todo
+  diagnostics: done
   exception-translations: done
   icon-translations: done
   reconfiguration-flow: done
diff --git a/tests/components/cookidoo/conftest.py b/tests/components/cookidoo/conftest.py
index 096b2abf958..7d84e7ac83e 100644
--- a/tests/components/cookidoo/conftest.py
+++ b/tests/components/cookidoo/conftest.py
@@ -9,6 +9,7 @@ from cookidoo_api import (
     CookidooAuthResponse,
     CookidooIngredientItem,
     CookidooSubscription,
+    CookidooUserInfo,
 )
 import pytest
 
@@ -58,7 +59,9 @@ def mock_cookidoo_client() -> Generator[AsyncMock]:
         client.get_active_subscription.return_value = CookidooSubscription(
             **load_json_object_fixture("subscriptions.json", DOMAIN)["data"]
         )
-
+        client.get_user_info.return_value = CookidooUserInfo(
+            **load_json_object_fixture("user_info.json", DOMAIN)["data"]
+        )
         client.login.return_value = CookidooAuthResponse(
             **load_json_object_fixture("login.json", DOMAIN)
         )
diff --git a/tests/components/cookidoo/fixtures/user_info.json b/tests/components/cookidoo/fixtures/user_info.json
new file mode 100644
index 00000000000..1c99ae84823
--- /dev/null
+++ b/tests/components/cookidoo/fixtures/user_info.json
@@ -0,0 +1,7 @@
+{
+  "data": {
+    "username": "username_1234",
+    "description": null,
+    "picture": null
+  }
+}
diff --git a/tests/components/cookidoo/snapshots/test_diagnostics.ambr b/tests/components/cookidoo/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..3dc799c1108
--- /dev/null
+++ b/tests/components/cookidoo/snapshots/test_diagnostics.ambr
@@ -0,0 +1,43 @@
+# serializer version: 1
+# name: test_diagnostics
+  dict({
+    'data': dict({
+      'additional_items': list([
+        dict({
+          'id': 'unique_id_tomaten',
+          'is_owned': False,
+          'name': 'Tomaten',
+        }),
+      ]),
+      'ingredient_items': list([
+        dict({
+          'description': '200 g',
+          'id': 'unique_id_mehl',
+          'is_owned': False,
+          'name': 'Mehl',
+        }),
+      ]),
+      'subscription': dict({
+        'active': True,
+        'expires': '2025-12-16T23:59:00Z',
+        'extended_type': 'REGULAR',
+        'start_date': '2024-12-16T00:00:00Z',
+        'status': 'ACTIVE',
+        'subscription_level': 'FULL',
+        'subscription_source': 'COMMERCE',
+        'type': 'REGULAR',
+      }),
+    }),
+    'entry_data': dict({
+      'country': 'CH',
+      'email': 'test-email',
+      'language': 'de-CH',
+      'password': '**REDACTED**',
+    }),
+    'user': dict({
+      'description': None,
+      'picture': None,
+      'username': 'username_1234',
+    }),
+  })
+# ---
diff --git a/tests/components/cookidoo/test_diagnostics.py b/tests/components/cookidoo/test_diagnostics.py
new file mode 100644
index 00000000000..c253e1f6e09
--- /dev/null
+++ b/tests/components/cookidoo/test_diagnostics.py
@@ -0,0 +1,29 @@
+"""Tests for the diagnostics data provided by the Cookidoo integration."""
+
+from unittest.mock import AsyncMock
+
+from syrupy import SnapshotAssertion
+
+from homeassistant.core import HomeAssistant
+
+from . import setup_integration
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+async def test_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    mock_cookidoo_client: AsyncMock,
+    cookidoo_config_entry: MockConfigEntry,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test diagnostics."""
+    await setup_integration(hass, cookidoo_config_entry)
+
+    assert (
+        await get_diagnostics_for_config_entry(hass, hass_client, cookidoo_config_entry)
+        == snapshot
+    )