diff --git a/homeassistant/components/bang_olufsen/diagnostics.py b/homeassistant/components/bang_olufsen/diagnostics.py
new file mode 100644
index 00000000000..cab7eae5e25
--- /dev/null
+++ b/homeassistant/components/bang_olufsen/diagnostics.py
@@ -0,0 +1,40 @@
+"""Support for Bang & Olufsen diagnostics."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any
+
+from homeassistant.components.media_player import DOMAIN as MEDIA_PLAYER_DOMAIN
+from homeassistant.core import HomeAssistant
+import homeassistant.helpers.entity_registry as er
+
+from . import BangOlufsenConfigEntry
+from .const import DOMAIN
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: BangOlufsenConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+
+    data: dict = {
+        "config_entry": config_entry.as_dict(),
+        "websocket_connected": config_entry.runtime_data.client.websocket_connected,
+    }
+
+    if TYPE_CHECKING:
+        assert config_entry.unique_id
+
+    # Add media_player entity's state
+    entity_registry = er.async_get(hass)
+    if entity_id := entity_registry.async_get_entity_id(
+        MEDIA_PLAYER_DOMAIN, DOMAIN, config_entry.unique_id
+    ):
+        if state := hass.states.get(entity_id):
+            state_dict = dict(state.as_dict())
+
+            # Remove context as it is not relevant
+            state_dict.pop("context")
+            data["media_player"] = state_dict
+
+    return data
diff --git a/tests/components/bang_olufsen/snapshots/test_diagnostics.ambr b/tests/components/bang_olufsen/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..e9540b5cec6
--- /dev/null
+++ b/tests/components/bang_olufsen/snapshots/test_diagnostics.ambr
@@ -0,0 +1,67 @@
+# serializer version: 1
+# name: test_async_get_config_entry_diagnostics
+  dict({
+    'config_entry': dict({
+      'data': dict({
+        'host': '192.168.0.1',
+        'jid': '1111.1111111.11111111@products.bang-olufsen.com',
+        'model': 'Beosound Balance',
+        'name': 'Beosound Balance-11111111',
+      }),
+      'disabled_by': None,
+      'discovery_keys': dict({
+      }),
+      'domain': 'bang_olufsen',
+      'minor_version': 1,
+      'options': dict({
+      }),
+      'pref_disable_new_entities': False,
+      'pref_disable_polling': False,
+      'source': 'user',
+      'title': 'Beosound Balance-11111111',
+      'unique_id': '11111111',
+      'version': 1,
+    }),
+    'media_player': dict({
+      'attributes': dict({
+        'beolink': dict({
+          'listeners': dict({
+            'Lego room Balance': '1111.1111111.33333333@products.bang-olufsen.com',
+            'Lounge room Balance': '1111.1111111.44444444@products.bang-olufsen.com',
+          }),
+          'peers': dict({
+            'Lego room Balance': '1111.1111111.33333333@products.bang-olufsen.com',
+            'Lounge room Balance': '1111.1111111.44444444@products.bang-olufsen.com',
+          }),
+          'self': dict({
+            'Living room Balance': '1111.1111111.11111111@products.bang-olufsen.com',
+          }),
+        }),
+        'device_class': 'speaker',
+        'entity_picture_local': None,
+        'friendly_name': 'Living room Balance',
+        'group_members': list([
+          'media_player.beosound_balance_11111111',
+          'listener_not_in_hass-1111.1111111.33333333@products.bang-olufsen.com',
+          'listener_not_in_hass-1111.1111111.44444444@products.bang-olufsen.com',
+        ]),
+        'media_content_type': 'music',
+        'sound_mode': 'Test Listening Mode (123)',
+        'sound_mode_list': list([
+          'Test Listening Mode (123)',
+          'Test Listening Mode (234)',
+          'Test Listening Mode 2 (345)',
+        ]),
+        'source_list': list([
+          'Tidal',
+          'Line-In',
+          'HDMI A',
+        ]),
+        'supported_features': 2095933,
+      }),
+      'entity_id': 'media_player.beosound_balance_11111111',
+      'state': 'playing',
+    }),
+    'websocket_connected': False,
+  })
+# ---
diff --git a/tests/components/bang_olufsen/test_diagnostics.py b/tests/components/bang_olufsen/test_diagnostics.py
new file mode 100644
index 00000000000..7c99648ace4
--- /dev/null
+++ b/tests/components/bang_olufsen/test_diagnostics.py
@@ -0,0 +1,41 @@
+"""Test bang_olufsen config entry diagnostics."""
+
+from unittest.mock import AsyncMock
+
+from syrupy import SnapshotAssertion
+from syrupy.filters import props
+
+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
+
+
+async def test_async_get_config_entry_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    mock_config_entry: MockConfigEntry,
+    mock_mozart_client: AsyncMock,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test config entry diagnostics."""
+    mock_config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+
+    result = await get_diagnostics_for_config_entry(
+        hass, hass_client, mock_config_entry
+    )
+
+    assert result == snapshot(
+        exclude=props(
+            "created_at",
+            "entry_id",
+            "id",
+            "last_changed",
+            "last_reported",
+            "last_updated",
+            "media_position_updated_at",
+            "modified_at",
+        )
+    )