diff --git a/homeassistant/components/ecovacs/diagnostics.py b/homeassistant/components/ecovacs/diagnostics.py
new file mode 100644
index 00000000000..fa7d85ed52a
--- /dev/null
+++ b/homeassistant/components/ecovacs/diagnostics.py
@@ -0,0 +1,36 @@
+"""Ecovacs diagnostics."""
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_NAME, CONF_PASSWORD, CONF_USERNAME
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+from .controller import EcovacsController
+
+REDACT_CONFIG = {CONF_USERNAME, CONF_PASSWORD, "title"}
+REDACT_DEVICE = {"did", CONF_NAME, "homeId"}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    controller: EcovacsController = hass.data[DOMAIN][config_entry.entry_id]
+    diag: dict[str, Any] = {
+        "config": async_redact_data(config_entry.as_dict(), REDACT_CONFIG)
+    }
+
+    diag["devices"] = [
+        async_redact_data(device.device_info.api_device_info, REDACT_DEVICE)
+        for device in controller.devices
+    ]
+    diag["legacy_devices"] = [
+        async_redact_data(device.vacuum, REDACT_DEVICE)
+        for device in controller.legacy_devices
+    ]
+
+    return diag
diff --git a/tests/components/ecovacs/snapshots/test_diagnostics.ambr b/tests/components/ecovacs/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..9b27883745b
--- /dev/null
+++ b/tests/components/ecovacs/snapshots/test_diagnostics.ambr
@@ -0,0 +1,50 @@
+# serializer version: 1
+# name: test_diagnostics
+  dict({
+    'config': dict({
+      'data': dict({
+        'country': 'IT',
+        'password': '**REDACTED**',
+        'username': '**REDACTED**',
+      }),
+      'disabled_by': None,
+      'domain': 'ecovacs',
+      'minor_version': 1,
+      'options': dict({
+      }),
+      'pref_disable_new_entities': False,
+      'pref_disable_polling': False,
+      'source': 'user',
+      'title': '**REDACTED**',
+      'unique_id': None,
+      'version': 1,
+    }),
+    'devices': list([
+      dict({
+        'UILogicId': 'DX_9G',
+        'class': 'yna5xi',
+        'company': 'eco-ng',
+        'deviceName': 'DEEBOT OZMO 950 Series',
+        'did': '**REDACTED**',
+        'homeSort': 9999,
+        'icon': 'https://portal-ww.ecouser.net/api/pim/file/get/606278df4a84d700082b39f1',
+        'materialNo': '110-1820-0101',
+        'model': 'DX9G',
+        'name': '**REDACTED**',
+        'nick': 'Ozmo 950',
+        'otaUpgrade': dict({
+        }),
+        'pid': '5c19a91ca1e6ee000178224a',
+        'product_category': 'DEEBOT',
+        'resource': 'upQ6',
+        'service': dict({
+          'jmq': 'jmq-ngiot-eu.dc.ww.ecouser.net',
+          'mqs': 'api-ngiot.dc-as.ww.ecouser.net',
+        }),
+        'status': 1,
+      }),
+    ]),
+    'legacy_devices': list([
+    ]),
+  })
+# ---
diff --git a/tests/components/ecovacs/test_diagnostics.py b/tests/components/ecovacs/test_diagnostics.py
new file mode 100644
index 00000000000..8244efd7fec
--- /dev/null
+++ b/tests/components/ecovacs/test_diagnostics.py
@@ -0,0 +1,22 @@
+"""Tests for diagnostics data."""
+
+from syrupy.assertion 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_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    init_integration: MockConfigEntry,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test diagnostics."""
+    assert await get_diagnostics_for_config_entry(
+        hass, hass_client, init_integration
+    ) == snapshot(exclude=props("entry_id"))