diff --git a/homeassistant/components/intent/__init__.py b/homeassistant/components/intent/__init__.py
index 30aaa933072..1ffb8747d91 100644
--- a/homeassistant/components/intent/__init__.py
+++ b/homeassistant/components/intent/__init__.py
@@ -45,6 +45,7 @@ from homeassistant.util import dt as dt_util
 
 from .const import DOMAIN, TIMER_DATA
 from .timers import (
+    CancelAllTimersIntentHandler,
     CancelTimerIntentHandler,
     DecreaseTimerIntentHandler,
     IncreaseTimerIntentHandler,
@@ -130,6 +131,7 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     intent.async_register(hass, SetPositionIntentHandler())
     intent.async_register(hass, StartTimerIntentHandler())
     intent.async_register(hass, CancelTimerIntentHandler())
+    intent.async_register(hass, CancelAllTimersIntentHandler())
     intent.async_register(hass, IncreaseTimerIntentHandler())
     intent.async_register(hass, DecreaseTimerIntentHandler())
     intent.async_register(hass, PauseTimerIntentHandler())
diff --git a/homeassistant/components/intent/timers.py b/homeassistant/components/intent/timers.py
index 639744abc66..0be123dcd18 100644
--- a/homeassistant/components/intent/timers.py
+++ b/homeassistant/components/intent/timers.py
@@ -887,6 +887,32 @@ class CancelTimerIntentHandler(intent.IntentHandler):
         return intent_obj.create_response()
 
 
+class CancelAllTimersIntentHandler(intent.IntentHandler):
+    """Intent handler for cancelling all timers."""
+
+    intent_type = intent.INTENT_CANCEL_ALL_TIMERS
+    description = "Cancels all timers"
+    slot_schema = {
+        vol.Optional("area"): cv.string,
+    }
+
+    async def async_handle(self, intent_obj: intent.Intent) -> intent.IntentResponse:
+        """Handle the intent."""
+        hass = intent_obj.hass
+        timer_manager: TimerManager = hass.data[TIMER_DATA]
+        slots = self.async_validate_slots(intent_obj.slots)
+        canceled = 0
+
+        for timer in _find_timers(hass, intent_obj.device_id, slots):
+            timer_manager.cancel_timer(timer.id)
+            canceled += 1
+
+        response = intent_obj.create_response()
+        response.async_set_speech_slots({"canceled": canceled})
+
+        return response
+
+
 class IncreaseTimerIntentHandler(intent.IntentHandler):
     """Intent handler for increasing the time of a timer."""
 
diff --git a/homeassistant/helpers/intent.py b/homeassistant/helpers/intent.py
index b38f769b302..468539f5a9d 100644
--- a/homeassistant/helpers/intent.py
+++ b/homeassistant/helpers/intent.py
@@ -49,6 +49,7 @@ INTENT_NEVERMIND = "HassNevermind"
 INTENT_SET_POSITION = "HassSetPosition"
 INTENT_START_TIMER = "HassStartTimer"
 INTENT_CANCEL_TIMER = "HassCancelTimer"
+INTENT_CANCEL_ALL_TIMERS = "HassCancelAllTimers"
 INTENT_INCREASE_TIMER = "HassIncreaseTimer"
 INTENT_DECREASE_TIMER = "HassDecreaseTimer"
 INTENT_PAUSE_TIMER = "HassPauseTimer"
diff --git a/tests/components/intent/test_timers.py b/tests/components/intent/test_timers.py
index d194d532513..7c4a8790206 100644
--- a/tests/components/intent/test_timers.py
+++ b/tests/components/intent/test_timers.py
@@ -1587,3 +1587,181 @@ async def test_async_device_supports_timers(hass: HomeAssistant) -> None:
 
     # After handler registration
     assert async_device_supports_timers(hass, device_id)
+
+
+async def test_cancel_all_timers(hass: HomeAssistant, init_components) -> None:
+    """Test cancelling all timers."""
+    device_id = "test_device"
+
+    started_event = asyncio.Event()
+    num_started = 0
+
+    @callback
+    def handle_timer(event_type: TimerEventType, timer: TimerInfo) -> None:
+        nonlocal num_started
+
+        if event_type == TimerEventType.STARTED:
+            num_started += 1
+            if num_started == 3:
+                started_event.set()
+
+    async_register_timer_handler(hass, device_id, handle_timer)
+
+    # Start timers
+    result = await intent.async_handle(
+        hass,
+        "test",
+        intent.INTENT_START_TIMER,
+        {"name": {"value": "pizza"}, "minutes": {"value": 10}},
+        device_id=device_id,
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+
+    result = await intent.async_handle(
+        hass,
+        "test",
+        intent.INTENT_START_TIMER,
+        {"name": {"value": "tv"}, "minutes": {"value": 10}},
+        device_id=device_id,
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+
+    result2 = await intent.async_handle(
+        hass,
+        "test",
+        intent.INTENT_START_TIMER,
+        {"name": {"value": "media"}, "minutes": {"value": 15}},
+        device_id=device_id,
+    )
+    assert result2.response_type == intent.IntentResponseType.ACTION_DONE
+
+    # Wait for all timers to start
+    async with asyncio.timeout(1):
+        await started_event.wait()
+
+    # Cancel all timers
+    result = await intent.async_handle(
+        hass, "test", intent.INTENT_CANCEL_ALL_TIMERS, {}, device_id=device_id
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+    assert result.speech_slots.get("canceled", 0) == 3
+
+    # No timers should be running for test_device
+    result = await intent.async_handle(
+        hass, "test", intent.INTENT_TIMER_STATUS, {}, device_id=device_id
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+    timers = result.speech_slots.get("timers", [])
+    assert len(timers) == 0
+
+
+async def test_cancel_all_timers_area(
+    hass: HomeAssistant,
+    init_components,
+    area_registry: ar.AreaRegistry,
+    device_registry: dr.DeviceRegistry,
+) -> None:
+    """Test cancelling all timers in an area."""
+    entry = MockConfigEntry()
+    entry.add_to_hass(hass)
+
+    area_kitchen = area_registry.async_create("kitchen")
+    device_kitchen = device_registry.async_get_or_create(
+        config_entry_id=entry.entry_id,
+        connections=set(),
+        identifiers={("test", "kitchen-device")},
+    )
+    device_registry.async_update_device(device_kitchen.id, area_id=area_kitchen.id)
+
+    area_living_room = area_registry.async_create("living room")
+    device_living_room = device_registry.async_get_or_create(
+        config_entry_id=entry.entry_id,
+        connections=set(),
+        identifiers={("test", "living_room-device")},
+    )
+    device_registry.async_update_device(
+        device_living_room.id, area_id=area_living_room.id
+    )
+
+    started_event = asyncio.Event()
+    num_timers = 3
+    num_started = 0
+
+    @callback
+    def handle_timer(event_type: TimerEventType, timer: TimerInfo) -> None:
+        nonlocal num_started
+
+        if event_type == TimerEventType.STARTED:
+            num_started += 1
+            if num_started == num_timers:
+                started_event.set()
+
+    async_register_timer_handler(hass, device_kitchen.id, handle_timer)
+    async_register_timer_handler(hass, device_living_room.id, handle_timer)
+
+    # Start timers in different areas
+    result = await intent.async_handle(
+        hass,
+        "test",
+        intent.INTENT_START_TIMER,
+        {"name": {"value": "pizza"}, "minutes": {"value": 10}},
+        device_id=device_kitchen.id,
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+
+    result = await intent.async_handle(
+        hass,
+        "test",
+        intent.INTENT_START_TIMER,
+        {"name": {"value": "tv"}, "minutes": {"value": 10}},
+        device_id=device_living_room.id,
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+
+    result = await intent.async_handle(
+        hass,
+        "test",
+        intent.INTENT_START_TIMER,
+        {"name": {"value": "media"}, "minutes": {"value": 15}},
+        device_id=device_living_room.id,
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+
+    # Wait for all timers to start
+    async with asyncio.timeout(1):
+        await started_event.wait()
+
+    # Cancel all timers in kitchen
+    result = await intent.async_handle(
+        hass,
+        "test",
+        intent.INTENT_CANCEL_ALL_TIMERS,
+        {"area": {"value": "kitchen"}},
+        device_id=device_kitchen.id,
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+    assert result.speech_slots.get("canceled", 0) == 1
+
+    # No timers should be running in kitchen
+    result = await intent.async_handle(
+        hass,
+        "test",
+        intent.INTENT_TIMER_STATUS,
+        {"area": {"value": "kitchen"}},
+        device_id=device_kitchen.id,
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+    timers = result.speech_slots.get("timers", [])
+    assert len(timers) == 0
+
+    # timers should be running in living room
+    result = await intent.async_handle(
+        hass,
+        "test",
+        intent.INTENT_TIMER_STATUS,
+        {"area": {"value": "living room"}},
+        device_id=device_living_room.id,
+    )
+    assert result.response_type == intent.IntentResponseType.ACTION_DONE
+    timers = result.speech_slots.get("timers", [])
+    assert len(timers) == 2
diff --git a/tests/helpers/test_llm.py b/tests/helpers/test_llm.py
index cd36fe18933..7174d77886a 100644
--- a/tests/helpers/test_llm.py
+++ b/tests/helpers/test_llm.py
@@ -306,6 +306,7 @@ async def test_assist_api_tools(
         "HassSetPosition",
         "HassStartTimer",
         "HassCancelTimer",
+        "HassCancelAllTimers",
         "HassIncreaseTimer",
         "HassDecreaseTimer",
         "HassPauseTimer",