diff --git a/homeassistant/components/nest/diagnostics.py b/homeassistant/components/nest/diagnostics.py
new file mode 100644
index 00000000000..b60889358fd
--- /dev/null
+++ b/homeassistant/components/nest/diagnostics.py
@@ -0,0 +1,51 @@
+"""Diagnostics support for Nest."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from google_nest_sdm.device import Device
+from google_nest_sdm.device_traits import InfoTrait
+from google_nest_sdm.exceptions import ApiException
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+from .const import DATA_SUBSCRIBER, DOMAIN
+
+REDACT_DEVICE_TRAITS = {InfoTrait.NAME}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: ConfigEntry
+) -> dict:
+    """Return diagnostics for a config entry."""
+    if DATA_SUBSCRIBER not in hass.data[DOMAIN]:
+        return {"error": "No subscriber configured"}
+
+    subscriber = hass.data[DOMAIN][DATA_SUBSCRIBER]
+    try:
+        device_manager = await subscriber.async_get_device_manager()
+    except ApiException as err:
+        return {"error": str(err)}
+
+    return {
+        "devices": [
+            get_device_data(device) for device in device_manager.devices.values()
+        ]
+    }
+
+
+def get_device_data(device: Device) -> dict[str, Any]:
+    """Return diagnostic information about a device."""
+    # Return a simplified view of the API object, but skipping any id fields or
+    # traits that include unique identifiers or personally identifiable information.
+    # See https://developers.google.com/nest/device-access/traits for API details
+    return {
+        "type": device.type,
+        "traits": {
+            trait: data
+            for trait, data in device.raw_data.get("traits", {}).items()
+            if trait not in REDACT_DEVICE_TRAITS
+        },
+    }
diff --git a/tests/components/nest/common.py b/tests/components/nest/common.py
index 180821a8d9e..f61c50f686a 100644
--- a/tests/components/nest/common.py
+++ b/tests/components/nest/common.py
@@ -109,9 +109,12 @@ async def async_setup_sdm_platform(
     if structures:
         for structure in structures.values():
             device_manager.add_structure(structure)
+    platforms = []
+    if platform:
+        platforms = [platform]
     with patch(
         "homeassistant.helpers.config_entry_oauth2_flow.async_get_config_entry_implementation"
-    ), patch("homeassistant.components.nest.PLATFORMS", [platform]), patch(
+    ), patch("homeassistant.components.nest.PLATFORMS", platforms), patch(
         "homeassistant.components.nest.api.GoogleNestSubscriber",
         return_value=subscriber,
     ):
diff --git a/tests/components/nest/test_diagnostics.py b/tests/components/nest/test_diagnostics.py
new file mode 100644
index 00000000000..8d506dc37fe
--- /dev/null
+++ b/tests/components/nest/test_diagnostics.py
@@ -0,0 +1,86 @@
+"""Test nest diagnostics."""
+
+from unittest.mock import patch
+
+from google_nest_sdm.device import Device
+from google_nest_sdm.exceptions import SubscriberException
+
+from homeassistant.components.nest import DOMAIN
+from homeassistant.config_entries import ConfigEntryState
+from homeassistant.setup import async_setup_component
+
+from .common import CONFIG, async_setup_sdm_platform, create_config_entry
+
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+
+THERMOSTAT_TYPE = "sdm.devices.types.THERMOSTAT"
+
+
+async def test_entry_diagnostics(hass, hass_client):
+    """Test config entry diagnostics."""
+    devices = {
+        "some-device-id": Device.MakeDevice(
+            {
+                "name": "enterprises/project-id/devices/device-id",
+                "type": "sdm.devices.types.THERMOSTAT",
+                "assignee": "enterprises/project-id/structures/structure-id/rooms/room-id",
+                "traits": {
+                    "sdm.devices.traits.Info": {
+                        "customName": "My Sensor",
+                    },
+                    "sdm.devices.traits.Temperature": {
+                        "ambientTemperatureCelsius": 25.1,
+                    },
+                    "sdm.devices.traits.Humidity": {
+                        "ambientHumidityPercent": 35.0,
+                    },
+                },
+                "parentRelations": [
+                    {
+                        "parent": "enterprises/project-id/structures/structure-id/rooms/room-id",
+                        "displayName": "Lobby",
+                    }
+                ],
+            },
+            auth=None,
+        )
+    }
+    assert await async_setup_sdm_platform(hass, platform=None, devices=devices)
+
+    entries = hass.config_entries.async_entries(DOMAIN)
+    assert len(entries) == 1
+    config_entry = entries[0]
+    assert config_entry.state is ConfigEntryState.LOADED
+
+    # Test that only non identifiable device information is returned
+    assert await get_diagnostics_for_config_entry(hass, hass_client, config_entry) == {
+        "devices": [
+            {
+                "traits": {
+                    "sdm.devices.traits.Humidity": {"ambientHumidityPercent": 35.0},
+                    "sdm.devices.traits.Temperature": {
+                        "ambientTemperatureCelsius": 25.1
+                    },
+                },
+                "type": "sdm.devices.types.THERMOSTAT",
+            }
+        ],
+    }
+
+
+async def test_setup_susbcriber_failure(hass, hass_client):
+    """Test configuration error."""
+    config_entry = create_config_entry(hass)
+    with patch(
+        "homeassistant.helpers.config_entry_oauth2_flow.async_get_config_entry_implementation"
+    ), patch(
+        "homeassistant.components.nest.api.GoogleNestSubscriber.start_async",
+        side_effect=SubscriberException(),
+    ):
+        assert await async_setup_component(hass, DOMAIN, CONFIG)
+
+    assert config_entry.state is ConfigEntryState.SETUP_RETRY
+
+    assert await get_diagnostics_for_config_entry(hass, hass_client, config_entry) == {
+        "error": "No subscriber configured"
+    }