diff --git a/homeassistant/components/autarco/diagnostics.py b/homeassistant/components/autarco/diagnostics.py
new file mode 100644
index 00000000000..def9c6ddc30
--- /dev/null
+++ b/homeassistant/components/autarco/diagnostics.py
@@ -0,0 +1,33 @@
+"""Support for the Autarco diagnostics."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.core import HomeAssistant
+
+from . import AutarcoConfigEntry, AutarcoDataUpdateCoordinator
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: AutarcoConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    autarco_data: list[AutarcoDataUpdateCoordinator] = config_entry.runtime_data
+
+    return {
+        "sites_data": [
+            {
+                "id": coordinator.site.site_id,
+                "name": coordinator.site.system_name,
+                "health": coordinator.site.health,
+                "solar": {
+                    "power_production": coordinator.data.solar.power_production,
+                    "energy_production_today": coordinator.data.solar.energy_production_today,
+                    "energy_production_month": coordinator.data.solar.energy_production_month,
+                    "energy_production_total": coordinator.data.solar.energy_production_total,
+                },
+            }
+            for coordinator in autarco_data
+        ],
+    }
diff --git a/tests/components/autarco/snapshots/test_diagnostics.ambr b/tests/components/autarco/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..fff1a1067f7
--- /dev/null
+++ b/tests/components/autarco/snapshots/test_diagnostics.ambr
@@ -0,0 +1,18 @@
+# serializer version: 1
+# name: test_entry_diagnostics
+  dict({
+    'sites_data': list([
+      dict({
+        'health': 'OK',
+        'id': 1,
+        'name': 'test-system',
+        'solar': dict({
+          'energy_production_month': 58,
+          'energy_production_today': 4,
+          'energy_production_total': 10379,
+          'power_production': 200,
+        }),
+      }),
+    ]),
+  })
+# ---
diff --git a/tests/components/autarco/test_diagnostics.py b/tests/components/autarco/test_diagnostics.py
new file mode 100644
index 00000000000..1d12a2c1894
--- /dev/null
+++ b/tests/components/autarco/test_diagnostics.py
@@ -0,0 +1,30 @@
+"""Test Autarco diagnostics."""
+
+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_entry_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    mock_autarco_client: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test config entry diagnostics."""
+    await setup_integration(hass, mock_config_entry)
+
+    result = await get_diagnostics_for_config_entry(
+        hass, hass_client, mock_config_entry
+    )
+
+    assert result == snapshot