diff --git a/homeassistant/components/imgw_pib/diagnostics.py b/homeassistant/components/imgw_pib/diagnostics.py
new file mode 100644
index 00000000000..d135208115f
--- /dev/null
+++ b/homeassistant/components/imgw_pib/diagnostics.py
@@ -0,0 +1,22 @@
+"""Diagnostics support for IMGW-PIB."""
+
+from __future__ import annotations
+
+from dataclasses import asdict
+from typing import Any
+
+from homeassistant.core import HomeAssistant
+
+from . import ImgwPibConfigEntry
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ImgwPibConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator = entry.runtime_data.coordinator
+
+    return {
+        "config_entry_data": entry.as_dict(),
+        "hydrological_data": asdict(coordinator.data),
+    }
diff --git a/tests/components/imgw_pib/snapshots/test_diagnostics.ambr b/tests/components/imgw_pib/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..096e370ab02
--- /dev/null
+++ b/tests/components/imgw_pib/snapshots/test_diagnostics.ambr
@@ -0,0 +1,50 @@
+# serializer version: 1
+# name: test_entry_diagnostics
+  dict({
+    'config_entry_data': dict({
+      'data': dict({
+        'station_id': '123',
+      }),
+      'disabled_by': None,
+      'domain': 'imgw_pib',
+      'minor_version': 1,
+      'options': dict({
+      }),
+      'pref_disable_new_entities': False,
+      'pref_disable_polling': False,
+      'source': 'user',
+      'title': 'River Name (Station Name)',
+      'unique_id': '123',
+      'version': 1,
+    }),
+    'hydrological_data': dict({
+      'flood_alarm': False,
+      'flood_alarm_level': dict({
+        'name': 'Flood Alarm Level',
+        'unit': None,
+        'value': 630.0,
+      }),
+      'flood_warning': False,
+      'flood_warning_level': dict({
+        'name': 'Flood Warning Level',
+        'unit': None,
+        'value': 590.0,
+      }),
+      'river': 'River Name',
+      'station': 'Station Name',
+      'station_id': '123',
+      'water_level': dict({
+        'name': 'Water Level',
+        'unit': None,
+        'value': 526.0,
+      }),
+      'water_level_measurement_date': '2024-04-27T10:00:00+00:00',
+      'water_temperature': dict({
+        'name': 'Water Temperature',
+        'unit': None,
+        'value': 10.8,
+      }),
+      'water_temperature_measurement_date': '2024-04-27T10:10:00+00:00',
+    }),
+  })
+# ---
diff --git a/tests/components/imgw_pib/test_diagnostics.py b/tests/components/imgw_pib/test_diagnostics.py
new file mode 100644
index 00000000000..62dabc982c4
--- /dev/null
+++ b/tests/components/imgw_pib/test_diagnostics.py
@@ -0,0 +1,31 @@
+"""Test the IMGW-PIB diagnostics platform."""
+
+from unittest.mock import AsyncMock
+
+from syrupy import SnapshotAssertion
+from syrupy.filters import props
+
+from homeassistant.core import HomeAssistant
+
+from . import init_integration
+
+from tests.common import MockConfigEntry
+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,
+    snapshot: SnapshotAssertion,
+    mock_config_entry: MockConfigEntry,
+    mock_imgw_pib_client: AsyncMock,
+) -> None:
+    """Test config entry diagnostics."""
+    await init_integration(hass, mock_config_entry)
+
+    result = await get_diagnostics_for_config_entry(
+        hass, hass_client, mock_config_entry
+    )
+
+    assert result == snapshot(exclude=props("entry_id"))