diff --git a/homeassistant/components/lamarzocco/icons.json b/homeassistant/components/lamarzocco/icons.json
index 2964f48ecbd..8ea764b4d18 100644
--- a/homeassistant/components/lamarzocco/icons.json
+++ b/homeassistant/components/lamarzocco/icons.json
@@ -76,6 +76,9 @@
       "coffee_boiler_ready_time": {
         "default": "mdi:av-timer"
       },
+      "last_cleaning_time": {
+        "default": "mdi:spray-bottle"
+      },
       "steam_boiler_ready_time": {
         "default": "mdi:av-timer"
       }
diff --git a/homeassistant/components/lamarzocco/sensor.py b/homeassistant/components/lamarzocco/sensor.py
index 17f11534483..9c1214835fa 100644
--- a/homeassistant/components/lamarzocco/sensor.py
+++ b/homeassistant/components/lamarzocco/sensor.py
@@ -7,6 +7,7 @@ from typing import cast
 
 from pylamarzocco.const import ModelName, WidgetType
 from pylamarzocco.models import (
+    BackFlush,
     BaseWidgetOutput,
     CoffeeBoiler,
     SteamBoilerLevel,
@@ -84,6 +85,17 @@ ENTITIES: tuple[LaMarzoccoSensorEntityDescription, ...] = (
             in (ModelName.GS3_AV, ModelName.GS3_MP, ModelName.LINEA_MINI)
         ),
     ),
+    LaMarzoccoSensorEntityDescription(
+        key="last_cleaning_time",
+        translation_key="last_cleaning_time",
+        device_class=SensorDeviceClass.TIMESTAMP,
+        value_fn=(
+            lambda config: cast(
+                BackFlush, config[WidgetType.CM_BACK_FLUSH]
+            ).last_cleaning_start_time
+        ),
+        entity_category=EntityCategory.DIAGNOSTIC,
+    ),
 )
 
 
diff --git a/homeassistant/components/lamarzocco/strings.json b/homeassistant/components/lamarzocco/strings.json
index 7a77b8ad72c..9b153b5707e 100644
--- a/homeassistant/components/lamarzocco/strings.json
+++ b/homeassistant/components/lamarzocco/strings.json
@@ -146,6 +146,9 @@
       },
       "steam_boiler_ready_time": {
         "name": "Steam boiler ready time"
+      },
+      "last_cleaning_time": {
+        "name": "Last cleaning time"
       }
     },
     "switch": {
diff --git a/tests/components/lamarzocco/fixtures/config_gs3.json b/tests/components/lamarzocco/fixtures/config_gs3.json
index 0c6c6c70b0a..8958bb90fc4 100644
--- a/tests/components/lamarzocco/fixtures/config_gs3.json
+++ b/tests/components/lamarzocco/fixtures/config_gs3.json
@@ -299,7 +299,7 @@
       "code": "CMBackFlush",
       "index": 1,
       "output": {
-        "lastCleaningStartTime": null,
+        "lastCleaningStartTime": 1743236747166,
         "status": "Off"
       },
       "tutorialUrl": "http://lamarzocco.com/it/en/app/support/cleaning-and-backflush/#gs3-av"
diff --git a/tests/components/lamarzocco/snapshots/test_diagnostics.ambr b/tests/components/lamarzocco/snapshots/test_diagnostics.ambr
index 6026ea0d7f4..31292862824 100644
--- a/tests/components/lamarzocco/snapshots/test_diagnostics.ambr
+++ b/tests/components/lamarzocco/snapshots/test_diagnostics.ambr
@@ -7,7 +7,7 @@
       'coffee_station': None,
       'config': dict({
         'CMBackFlush': dict({
-          'last_cleaning_start_time': None,
+          'last_cleaning_start_time': '2025-03-29T08:25:47.166000+00:00',
           'status': 'Off',
         }),
         'CMCoffeeBoiler': dict({
@@ -571,7 +571,7 @@
           'code': 'CMBackFlush',
           'index': 1,
           'output': dict({
-            'last_cleaning_start_time': None,
+            'last_cleaning_start_time': '2025-03-29T08:25:47.166000+00:00',
             'status': 'Off',
           }),
         }),
diff --git a/tests/components/lamarzocco/snapshots/test_sensor.ambr b/tests/components/lamarzocco/snapshots/test_sensor.ambr
index 311e7416b1c..f23771b77b4 100644
--- a/tests/components/lamarzocco/snapshots/test_sensor.ambr
+++ b/tests/components/lamarzocco/snapshots/test_sensor.ambr
@@ -47,6 +47,54 @@
     'state': 'unknown',
   })
 # ---
+# name: test_sensors[sensor.gs012345_last_cleaning_time-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': set({
+    }),
+    'area_id': None,
+    'capabilities': None,
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
+    'entity_id': 'sensor.gs012345_last_cleaning_time',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'options': dict({
+    }),
+    'original_device_class': <SensorDeviceClass.TIMESTAMP: 'timestamp'>,
+    'original_icon': None,
+    'original_name': 'Last cleaning time',
+    'platform': 'lamarzocco',
+    'previous_unique_id': None,
+    'supported_features': 0,
+    'translation_key': 'last_cleaning_time',
+    'unique_id': 'GS012345_last_cleaning_time',
+    'unit_of_measurement': None,
+  })
+# ---
+# name: test_sensors[sensor.gs012345_last_cleaning_time-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'timestamp',
+      'friendly_name': 'GS012345 Last cleaning time',
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.gs012345_last_cleaning_time',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '2025-03-29T08:25:47+00:00',
+  })
+# ---
 # name: test_sensors[sensor.gs012345_steam_boiler_ready_time-entry]
   EntityRegistryEntrySnapshot({
     'aliases': set({