diff --git a/homeassistant/components/matter/sensor.py b/homeassistant/components/matter/sensor.py
index 62c70f777e7..f563c246186 100644
--- a/homeassistant/components/matter/sensor.py
+++ b/homeassistant/components/matter/sensor.py
@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 from dataclasses import dataclass, field
-from datetime import datetime
+from datetime import datetime, timedelta
 from typing import TYPE_CHECKING, cast
 
 from chip.clusters import Objects as clusters
@@ -44,7 +44,7 @@ from homeassistant.const import (
 )
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
-from homeassistant.util import slugify
+from homeassistant.util import dt as dt_util, slugify
 
 from .entity import MatterEntity, MatterEntityDescription
 from .helpers import get_matter
@@ -942,6 +942,21 @@ DISCOVERY_SCHEMAS = [
         # don't discover this entry if the supported state list is empty
         secondary_value_is_not=[],
     ),
+    MatterDiscoverySchema(
+        platform=Platform.SENSOR,
+        entity_description=MatterSensorEntityDescription(
+            key="OperationalStateCountdownTime",
+            translation_key="estimated_end_time",
+            device_class=SensorDeviceClass.TIMESTAMP,
+            state_class=None,
+            # Add countdown to current datetime to get the estimated end time
+            device_to_ha=(
+                lambda x: dt_util.utcnow() + timedelta(seconds=x) if x > 0 else None
+            ),
+        ),
+        entity_class=MatterSensor,
+        required_attributes=(clusters.OperationalState.Attributes.CountdownTime,),
+    ),
     MatterDiscoverySchema(
         platform=Platform.SENSOR,
         entity_description=MatterListSensorEntityDescription(
diff --git a/homeassistant/components/matter/strings.json b/homeassistant/components/matter/strings.json
index 0ac44c006ab..2534dd6aa6e 100644
--- a/homeassistant/components/matter/strings.json
+++ b/homeassistant/components/matter/strings.json
@@ -318,6 +318,9 @@
           "docked": "Docked"
         }
       },
+      "estimated_end_time": {
+        "name": "Estimated end time"
+      },
       "switch_current_position": {
         "name": "Current switch position"
       },
diff --git a/tests/components/matter/snapshots/test_sensor.ambr b/tests/components/matter/snapshots/test_sensor.ambr
index 8e459c0f573..472799b80ae 100644
--- a/tests/components/matter/snapshots/test_sensor.ambr
+++ b/tests/components/matter/snapshots/test_sensor.ambr
@@ -3443,6 +3443,55 @@
     'state': '1.3',
   })
 # ---
+# name: test_sensors[microwave_oven][sensor.microwave_oven_estimated_end_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': None,
+    'entity_id': 'sensor.microwave_oven_estimated_end_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': 'Estimated end time',
+    'platform': 'matter',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'estimated_end_time',
+    'unique_id': '00000000000004D2-000000000000009D-MatterNodeDevice-1-OperationalStateCountdownTime-96-2',
+    'unit_of_measurement': None,
+  })
+# ---
+# name: test_sensors[microwave_oven][sensor.microwave_oven_estimated_end_time-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'timestamp',
+      'friendly_name': 'Microwave Oven Estimated end time',
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.microwave_oven_estimated_end_time',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '2025-01-01T14:00:30+00:00',
+  })
+# ---
 # name: test_sensors[microwave_oven][sensor.microwave_oven_operational_state-entry]
   EntityRegistryEntrySnapshot({
     'aliases': set({
diff --git a/tests/components/matter/test_sensor.py b/tests/components/matter/test_sensor.py
index 3e9af4a6e4b..883a976284e 100644
--- a/tests/components/matter/test_sensor.py
+++ b/tests/components/matter/test_sensor.py
@@ -17,6 +17,7 @@ from .common import (
 )
 
 
+@pytest.mark.freeze_time("2025-01-01T14:00:00+00:00")
 @pytest.mark.usefixtures("entity_registry_enabled_by_default", "matter_devices")
 async def test_sensors(
     hass: HomeAssistant,
@@ -381,6 +382,21 @@ async def test_draft_electrical_measurement_sensor(
     assert state.state == "unknown"
 
 
+@pytest.mark.freeze_time("2025-01-01T14:00:00+00:00")
+@pytest.mark.parametrize("node_fixture", ["microwave_oven"])
+async def test_countdown_time_sensor(
+    hass: HomeAssistant,
+    matter_client: MagicMock,
+    matter_node: MatterNode,
+) -> None:
+    """Test CountdownTime sensor."""
+    # OperationalState Cluster / CountdownTime (1/96/2)
+    state = hass.states.get("sensor.microwave_oven_estimated_end_time")
+    assert state
+    # 1/96/2 = 30 seconds, so 30 s should be added to the current time.
+    assert state.state == "2025-01-01T14:00:30+00:00"
+
+
 @pytest.mark.parametrize("node_fixture", ["silabs_laundrywasher"])
 async def test_list_sensor(
     hass: HomeAssistant,