diff --git a/homeassistant/components/recollect_waste/diagnostics.py b/homeassistant/components/recollect_waste/diagnostics.py
new file mode 100644
index 00000000000..fb19b1790f5
--- /dev/null
+++ b/homeassistant/components/recollect_waste/diagnostics.py
@@ -0,0 +1,23 @@
+"""Diagnostics support for ReCollect Waste."""
+from __future__ import annotations
+
+import dataclasses
+from typing import Any
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
+
+from .const import DOMAIN
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator: DataUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
+
+    return {
+        "entry": entry.as_dict(),
+        "data": [dataclasses.asdict(event) for event in coordinator.data],
+    }
diff --git a/tests/components/recollect_waste/conftest.py b/tests/components/recollect_waste/conftest.py
index 1bdf729c47b..a0d002e9d9a 100644
--- a/tests/components/recollect_waste/conftest.py
+++ b/tests/components/recollect_waste/conftest.py
@@ -1,6 +1,8 @@
 """Define test fixtures for ReCollect Waste."""
+from datetime import date
 from unittest.mock import patch
 
+from aiorecollect.client import PickupEvent, PickupType
 import pytest
 
 from homeassistant.components.recollect_waste.const import (
@@ -33,10 +35,16 @@ def config_fixture(hass):
 @pytest.fixture(name="setup_recollect_waste")
 async def setup_recollect_waste_fixture(hass, config):
     """Define a fixture to set up ReCollect Waste."""
+    pickup_event = PickupEvent(
+        date(2022, 1, 23), [PickupType("garbage", "Trash Collection")], "The Sun"
+    )
+
     with patch(
-        "homeassistant.components.recollect_waste.Client.async_get_pickup_events"
+        "homeassistant.components.recollect_waste.Client.async_get_pickup_events",
+        return_value=[pickup_event],
     ), patch(
-        "homeassistant.components.recollect_waste.config_flow.Client.async_get_pickup_events"
+        "homeassistant.components.recollect_waste.config_flow.Client.async_get_pickup_events",
+        return_value=[pickup_event],
     ), patch(
         "homeassistant.components.recollect_waste.PLATFORMS", []
     ):
diff --git a/tests/components/recollect_waste/test_diagnostics.py b/tests/components/recollect_waste/test_diagnostics.py
new file mode 100644
index 00000000000..c9c9ba5a93f
--- /dev/null
+++ b/tests/components/recollect_waste/test_diagnostics.py
@@ -0,0 +1,23 @@
+"""Test ReCollect Waste diagnostics."""
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+
+
+async def test_entry_diagnostics(
+    hass, config_entry, hass_client, setup_recollect_waste
+):
+    """Test config entry diagnostics."""
+    assert await get_diagnostics_for_config_entry(hass, hass_client, config_entry) == {
+        "entry": config_entry.as_dict(),
+        "data": [
+            {
+                "date": {
+                    "__type": "<class 'datetime.date'>",
+                    "isoformat": "2022-01-23",
+                },
+                "pickup_types": [
+                    {"name": "garbage", "friendly_name": "Trash Collection"}
+                ],
+                "area_name": "The Sun",
+            }
+        ],
+    }