diff --git a/homeassistant/components/conversation/agent_manager.py b/homeassistant/components/conversation/agent_manager.py
index aa8b7644900..8202b9a0ed4 100644
--- a/homeassistant/components/conversation/agent_manager.py
+++ b/homeassistant/components/conversation/agent_manager.py
@@ -96,6 +96,7 @@ async def async_converse(
         conversation_id=conversation_id,
         device_id=device_id,
         language=language,
+        agent_id=agent_id,
     )
     with async_conversation_trace() as trace:
         trace.add_event(
diff --git a/homeassistant/components/conversation/default_agent.py b/homeassistant/components/conversation/default_agent.py
index 2fe016351d6..2366722e929 100644
--- a/homeassistant/components/conversation/default_agent.py
+++ b/homeassistant/components/conversation/default_agent.py
@@ -354,6 +354,7 @@ class DefaultAgent(ConversationEntity):
                 language,
                 assistant=DOMAIN,
                 device_id=user_input.device_id,
+                conversation_agent_id=user_input.agent_id,
             )
         except intent.MatchFailedError as match_error:
             # Intent was valid, but no entities matched the constraints.
diff --git a/homeassistant/components/conversation/http.py b/homeassistant/components/conversation/http.py
index 866a910a4a7..e0821e14738 100644
--- a/homeassistant/components/conversation/http.py
+++ b/homeassistant/components/conversation/http.py
@@ -188,6 +188,7 @@ async def websocket_hass_agent_debug(
                 conversation_id=None,
                 device_id=msg.get("device_id"),
                 language=msg.get("language", hass.config.language),
+                agent_id=None,
             )
         )
         for sentence in msg["sentences"]
diff --git a/homeassistant/components/conversation/models.py b/homeassistant/components/conversation/models.py
index 3fd24152698..902b52483e0 100644
--- a/homeassistant/components/conversation/models.py
+++ b/homeassistant/components/conversation/models.py
@@ -27,6 +27,7 @@ class ConversationInput:
     conversation_id: str | None
     device_id: str | None
     language: str
+    agent_id: str | None = None
 
 
 @dataclass(slots=True)
diff --git a/homeassistant/components/intent/timers.py b/homeassistant/components/intent/timers.py
index 167f37ed6fc..f93b9a0e2b8 100644
--- a/homeassistant/components/intent/timers.py
+++ b/homeassistant/components/intent/timers.py
@@ -14,7 +14,7 @@ from typing import Any
 import voluptuous as vol
 
 from homeassistant.const import ATTR_DEVICE_ID, ATTR_ID, ATTR_NAME
-from homeassistant.core import HomeAssistant, callback
+from homeassistant.core import Context, HomeAssistant, callback
 from homeassistant.helpers import (
     area_registry as ar,
     config_validation as cv,
@@ -78,6 +78,18 @@ class TimerInfo:
     floor_id: str | None = None
     """Id of floor that the device's area belongs to."""
 
+    conversation_command: str | None = None
+    """Text of conversation command to execute when timer is finished.
+
+    This command must be in the language used to set the timer.
+    """
+
+    conversation_agent_id: str | None = None
+    """Id of the conversation agent used to set the timer.
+
+    This agent will be used to execute the conversation command.
+    """
+
     @property
     def seconds_left(self) -> int:
         """Return number of seconds left on the timer."""
@@ -207,6 +219,8 @@ class TimerManager:
         seconds: int | None,
         language: str,
         name: str | None = None,
+        conversation_command: str | None = None,
+        conversation_agent_id: str | None = None,
     ) -> str:
         """Start a timer."""
         if not self.is_timer_device(device_id):
@@ -235,6 +249,8 @@ class TimerManager:
             device_id=device_id,
             created_at=created_at,
             updated_at=created_at,
+            conversation_command=conversation_command,
+            conversation_agent_id=conversation_agent_id,
         )
 
         # Fill in area/floor info
@@ -410,6 +426,23 @@ class TimerManager:
             timer.device_id,
         )
 
+        if timer.conversation_command:
+            # pylint: disable-next=import-outside-toplevel
+            from homeassistant.components.conversation import async_converse
+
+            self.hass.async_create_background_task(
+                async_converse(
+                    self.hass,
+                    timer.conversation_command,
+                    conversation_id=None,
+                    context=Context(),
+                    language=timer.language,
+                    agent_id=timer.conversation_agent_id,
+                    device_id=timer.device_id,
+                ),
+                "timer assist command",
+            )
+
     def is_timer_device(self, device_id: str) -> bool:
         """Return True if device has been registered to handle timer events."""
         return device_id in self.handlers
@@ -742,6 +775,7 @@ class StartTimerIntentHandler(intent.IntentHandler):
     slot_schema = {
         vol.Required(vol.Any("hours", "minutes", "seconds")): cv.positive_int,
         vol.Optional("name"): cv.string,
+        vol.Optional("conversation_command"): cv.string,
     }
 
     async def async_handle(self, intent_obj: intent.Intent) -> intent.IntentResponse:
@@ -772,6 +806,10 @@ class StartTimerIntentHandler(intent.IntentHandler):
         if "seconds" in slots:
             seconds = int(slots["seconds"]["value"])
 
+        conversation_command: str | None = None
+        if "conversation_command" in slots:
+            conversation_command = slots["conversation_command"]["value"]
+
         timer_manager.start_timer(
             intent_obj.device_id,
             hours,
@@ -779,6 +817,8 @@ class StartTimerIntentHandler(intent.IntentHandler):
             seconds,
             language=intent_obj.language,
             name=name,
+            conversation_command=conversation_command,
+            conversation_agent_id=intent_obj.conversation_agent_id,
         )
 
         return intent_obj.create_response()
diff --git a/homeassistant/components/wyoming/manifest.json b/homeassistant/components/wyoming/manifest.json
index 70768329e60..30104a88dce 100644
--- a/homeassistant/components/wyoming/manifest.json
+++ b/homeassistant/components/wyoming/manifest.json
@@ -3,7 +3,7 @@
   "name": "Wyoming Protocol",
   "codeowners": ["@balloob", "@synesthesiam"],
   "config_flow": true,
-  "dependencies": ["assist_pipeline", "intent"],
+  "dependencies": ["assist_pipeline", "intent", "conversation"],
   "documentation": "https://www.home-assistant.io/integrations/wyoming",
   "integration_type": "service",
   "iot_class": "local_push",
diff --git a/homeassistant/helpers/intent.py b/homeassistant/helpers/intent.py
index 986bcd33484..ccef934d6ad 100644
--- a/homeassistant/helpers/intent.py
+++ b/homeassistant/helpers/intent.py
@@ -104,6 +104,7 @@ async def async_handle(
     language: str | None = None,
     assistant: str | None = None,
     device_id: str | None = None,
+    conversation_agent_id: str | None = None,
 ) -> IntentResponse:
     """Handle an intent."""
     handler = hass.data.get(DATA_KEY, {}).get(intent_type)
@@ -127,6 +128,7 @@ async def async_handle(
         language=language,
         assistant=assistant,
         device_id=device_id,
+        conversation_agent_id=conversation_agent_id,
     )
 
     try:
@@ -1156,6 +1158,7 @@ class Intent:
         "category",
         "assistant",
         "device_id",
+        "conversation_agent_id",
     ]
 
     def __init__(
@@ -1170,6 +1173,7 @@ class Intent:
         category: IntentCategory | None = None,
         assistant: str | None = None,
         device_id: str | None = None,
+        conversation_agent_id: str | None = None,
     ) -> None:
         """Initialize an intent."""
         self.hass = hass
@@ -1182,6 +1186,7 @@ class Intent:
         self.category = category
         self.assistant = assistant
         self.device_id = device_id
+        self.conversation_agent_id = conversation_agent_id
 
     @callback
     def create_response(self) -> IntentResponse:
diff --git a/tests/components/conversation/test_init.py b/tests/components/conversation/test_init.py
index 5b117c1ac70..64832761364 100644
--- a/tests/components/conversation/test_init.py
+++ b/tests/components/conversation/test_init.py
@@ -927,6 +927,7 @@ async def test_non_default_response(hass: HomeAssistant, init_components) -> Non
             conversation_id=None,
             device_id=None,
             language=hass.config.language,
+            agent_id=None,
         )
     )
     assert len(calls) == 1
diff --git a/tests/components/conversation/test_trigger.py b/tests/components/conversation/test_trigger.py
index 83f4e97c853..fe1181e48c4 100644
--- a/tests/components/conversation/test_trigger.py
+++ b/tests/components/conversation/test_trigger.py
@@ -555,6 +555,7 @@ async def test_trigger_with_device_id(hass: HomeAssistant) -> None:
             conversation_id=None,
             device_id="my_device",
             language=hass.config.language,
+            agent_id=None,
         )
     )
     assert result.response.speech["plain"]["speech"] == "my_device"
diff --git a/tests/components/intent/test_timers.py b/tests/components/intent/test_timers.py
index 273fe0d3be6..f014bb5880c 100644
--- a/tests/components/intent/test_timers.py
+++ b/tests/components/intent/test_timers.py
@@ -1421,6 +1421,48 @@ def test_round_time() -> None:
     assert _round_time(0, 0, 35) == (0, 0, 30)
 
 
+async def test_start_timer_with_conversation_command(
+    hass: HomeAssistant, init_components
+) -> None:
+    """Test starting a timer with an conversation command and having it finish."""
+    device_id = "test_device"
+    timer_name = "test timer"
+    test_command = "turn on the lights"
+    agent_id = "test_agent"
+    finished_event = asyncio.Event()
+
+    @callback
+    def handle_timer(event_type: TimerEventType, timer: TimerInfo) -> None:
+        if event_type == TimerEventType.FINISHED:
+            assert timer.conversation_command == test_command
+            assert timer.conversation_agent_id == agent_id
+            finished_event.set()
+
+    async_register_timer_handler(hass, device_id, handle_timer)
+
+    with patch("homeassistant.components.conversation.async_converse") as mock_converse:
+        result = await intent.async_handle(
+            hass,
+            "test",
+            intent.INTENT_START_TIMER,
+            {
+                "name": {"value": timer_name},
+                "seconds": {"value": 0},
+                "conversation_command": {"value": test_command},
+            },
+            device_id=device_id,
+            conversation_agent_id=agent_id,
+        )
+
+        assert result.response_type == intent.IntentResponseType.ACTION_DONE
+
+        async with asyncio.timeout(1):
+            await finished_event.wait()
+
+        mock_converse.assert_called_once()
+        assert mock_converse.call_args.args[1] == test_command
+
+
 async def test_pause_unpause_timer_disambiguate(
     hass: HomeAssistant, init_components
 ) -> None: