diff --git a/homeassistant/components/conversation/default_agent.py b/homeassistant/components/conversation/default_agent.py
index b0bbc8e7fec..336d6287f18 100644
--- a/homeassistant/components/conversation/default_agent.py
+++ b/homeassistant/components/conversation/default_agent.py
@@ -3,8 +3,9 @@ from __future__ import annotations
 
 import asyncio
 from collections import defaultdict
-from collections.abc import Iterable
+from collections.abc import Awaitable, Callable, Iterable
 from dataclasses import dataclass
+import functools
 import logging
 from pathlib import Path
 import re
@@ -42,6 +43,9 @@ _DEFAULT_ERROR_TEXT = "Sorry, I couldn't understand that"
 _ENTITY_REGISTRY_UPDATE_FIELDS = ["aliases", "name", "original_name"]
 
 REGEX_TYPE = type(re.compile(""))
+TRIGGER_CALLBACK_TYPE = Callable[  # pylint: disable=invalid-name
+    [str], Awaitable[str | None]
+]
 
 
 def json_load(fp: IO[str]) -> JsonObjectType:
@@ -60,6 +64,14 @@ class LanguageIntents:
     loaded_components: set[str]
 
 
+@dataclass(slots=True)
+class TriggerData:
+    """List of sentences and the callback for a trigger."""
+
+    sentences: list[str]
+    callback: TRIGGER_CALLBACK_TYPE
+
+
 def _get_language_variations(language: str) -> Iterable[str]:
     """Generate language codes with and without region."""
     yield language
@@ -110,6 +122,10 @@ class DefaultAgent(AbstractConversationAgent):
         self._config_intents: dict[str, Any] = {}
         self._slot_lists: dict[str, SlotList] | None = None
 
+        # Sentences that will trigger a callback (skipping intent recognition)
+        self._trigger_sentences: list[TriggerData] = []
+        self._trigger_intents: Intents | None = None
+
     @property
     def supported_languages(self) -> list[str]:
         """Return a list of supported languages."""
@@ -174,6 +190,9 @@ class DefaultAgent(AbstractConversationAgent):
 
     async def async_process(self, user_input: ConversationInput) -> ConversationResult:
         """Process a sentence."""
+        if trigger_result := await self._match_triggers(user_input.text):
+            return trigger_result
+
         language = user_input.language or self.hass.config.language
         conversation_id = None  # Not supported
 
@@ -605,6 +624,99 @@ class DefaultAgent(AbstractConversationAgent):
         response_str = lang_intents.error_responses.get(response_key)
         return response_str or _DEFAULT_ERROR_TEXT
 
+    def register_trigger(
+        self,
+        sentences: list[str],
+        callback: TRIGGER_CALLBACK_TYPE,
+    ) -> core.CALLBACK_TYPE:
+        """Register a list of sentences that will trigger a callback when recognized."""
+        trigger_data = TriggerData(sentences=sentences, callback=callback)
+        self._trigger_sentences.append(trigger_data)
+
+        # Force rebuild on next use
+        self._trigger_intents = None
+
+        unregister = functools.partial(self._unregister_trigger, trigger_data)
+        return unregister
+
+    def _rebuild_trigger_intents(self) -> None:
+        """Rebuild the HassIL intents object from the current trigger sentences."""
+        intents_dict = {
+            "language": self.hass.config.language,
+            "intents": {
+                # Use trigger data index as a virtual intent name for HassIL.
+                # This works because the intents are rebuilt on every
+                # register/unregister.
+                str(trigger_id): {"data": [{"sentences": trigger_data.sentences}]}
+                for trigger_id, trigger_data in enumerate(self._trigger_sentences)
+            },
+        }
+
+        self._trigger_intents = Intents.from_dict(intents_dict)
+        _LOGGER.debug("Rebuilt trigger intents: %s", intents_dict)
+
+    def _unregister_trigger(self, trigger_data: TriggerData) -> None:
+        """Unregister a set of trigger sentences."""
+        self._trigger_sentences.remove(trigger_data)
+
+        # Force rebuild on next use
+        self._trigger_intents = None
+
+    async def _match_triggers(self, sentence: str) -> ConversationResult | None:
+        """Try to match sentence against registered trigger sentences.
+
+        Calls the registered callbacks if there's a match and returns a positive
+        conversation result.
+        """
+        if not self._trigger_sentences:
+            # No triggers registered
+            return None
+
+        if self._trigger_intents is None:
+            # Need to rebuild intents before matching
+            self._rebuild_trigger_intents()
+
+        assert self._trigger_intents is not None
+
+        matched_triggers: set[int] = set()
+        for result in recognize_all(sentence, self._trigger_intents):
+            trigger_id = int(result.intent.name)
+            if trigger_id in matched_triggers:
+                # Already matched a sentence from this trigger
+                break
+
+            matched_triggers.add(trigger_id)
+
+        if not matched_triggers:
+            # Sentence did not match any trigger sentences
+            return None
+
+        _LOGGER.debug(
+            "'%s' matched %s trigger(s): %s",
+            sentence,
+            len(matched_triggers),
+            matched_triggers,
+        )
+
+        # Gather callback responses in parallel
+        trigger_responses = await asyncio.gather(
+            *(
+                self._trigger_sentences[trigger_id].callback(sentence)
+                for trigger_id in matched_triggers
+            )
+        )
+
+        # Use last non-empty result as speech response
+        speech: str | None = None
+        for trigger_response in trigger_responses:
+            speech = speech or trigger_response
+
+        response = intent.IntentResponse(language=self.hass.config.language)
+        response.response_type = intent.IntentResponseType.ACTION_DONE
+        response.async_set_speech(speech or "")
+
+        return ConversationResult(response=response)
+
 
 def _make_error_result(
     language: str,
diff --git a/homeassistant/components/conversation/trigger.py b/homeassistant/components/conversation/trigger.py
new file mode 100644
index 00000000000..c12808efa53
--- /dev/null
+++ b/homeassistant/components/conversation/trigger.py
@@ -0,0 +1,59 @@
+"""Offer sentence based automation rules."""
+from __future__ import annotations
+
+from typing import Any
+
+import voluptuous as vol
+
+from homeassistant.const import CONF_COMMAND, CONF_PLATFORM
+from homeassistant.core import CALLBACK_TYPE, HassJob, HomeAssistant, callback
+import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.trigger import TriggerActionType, TriggerInfo
+from homeassistant.helpers.typing import ConfigType
+
+from . import HOME_ASSISTANT_AGENT, _get_agent_manager
+from .const import DOMAIN
+from .default_agent import DefaultAgent
+
+TRIGGER_SCHEMA = cv.TRIGGER_BASE_SCHEMA.extend(
+    {
+        vol.Required(CONF_PLATFORM): DOMAIN,
+        vol.Required(CONF_COMMAND): vol.All(cv.ensure_list, [cv.string]),
+    }
+)
+
+
+async def async_attach_trigger(
+    hass: HomeAssistant,
+    config: ConfigType,
+    action: TriggerActionType,
+    trigger_info: TriggerInfo,
+) -> CALLBACK_TYPE:
+    """Listen for events based on configuration."""
+    trigger_data = trigger_info["trigger_data"]
+    sentences = config.get(CONF_COMMAND, [])
+
+    job = HassJob(action)
+
+    @callback
+    async def call_action(sentence: str) -> str | None:
+        """Call action with right context."""
+        trigger_input: dict[str, Any] = {  # Satisfy type checker
+            **trigger_data,
+            "platform": DOMAIN,
+            "sentence": sentence,
+        }
+
+        # Wait for the automation to complete
+        if future := hass.async_run_hass_job(
+            job,
+            {"trigger": trigger_input},
+        ):
+            await future
+
+        return None
+
+    default_agent = await _get_agent_manager(hass).async_get_agent(HOME_ASSISTANT_AGENT)
+    assert isinstance(default_agent, DefaultAgent)
+
+    return default_agent.register_trigger(sentences, call_action)
diff --git a/tests/components/conversation/test_default_agent.py b/tests/components/conversation/test_default_agent.py
index 58fe9371e11..899fd761d5e 100644
--- a/tests/components/conversation/test_default_agent.py
+++ b/tests/components/conversation/test_default_agent.py
@@ -1,5 +1,5 @@
 """Test for the default agent."""
-from unittest.mock import patch
+from unittest.mock import AsyncMock, patch
 
 import pytest
 
@@ -223,3 +223,45 @@ async def test_unexposed_entities_skipped(
     assert result.response.response_type == intent.IntentResponseType.QUERY_ANSWER
     assert len(result.response.matched_states) == 1
     assert result.response.matched_states[0].entity_id == exposed_light.entity_id
+
+
+async def test_trigger_sentences(hass: HomeAssistant, init_components) -> None:
+    """Test registering/unregistering/matching a few trigger sentences."""
+    trigger_sentences = ["It's party time", "It is time to party"]
+    trigger_response = "Cowabunga!"
+
+    agent = await conversation._get_agent_manager(hass).async_get_agent(
+        conversation.HOME_ASSISTANT_AGENT
+    )
+    assert isinstance(agent, conversation.DefaultAgent)
+
+    callback = AsyncMock(return_value=trigger_response)
+    unregister = agent.register_trigger(trigger_sentences, callback)
+
+    result = await conversation.async_converse(hass, "Not the trigger", None, Context())
+    assert result.response.response_type == intent.IntentResponseType.ERROR
+
+    # Using different case and including punctuation
+    test_sentences = ["it's party time!", "IT IS TIME TO PARTY."]
+    for sentence in test_sentences:
+        callback.reset_mock()
+        result = await conversation.async_converse(hass, sentence, None, Context())
+        callback.assert_called_once_with(sentence)
+        assert (
+            result.response.response_type == intent.IntentResponseType.ACTION_DONE
+        ), sentence
+        assert result.response.speech == {
+            "plain": {"speech": trigger_response, "extra_data": None}
+        }
+
+    unregister()
+
+    # Should produce errors now
+    callback.reset_mock()
+    for sentence in test_sentences:
+        result = await conversation.async_converse(hass, sentence, None, Context())
+        assert (
+            result.response.response_type == intent.IntentResponseType.ERROR
+        ), sentence
+
+    assert len(callback.mock_calls) == 0
diff --git a/tests/components/conversation/test_trigger.py b/tests/components/conversation/test_trigger.py
new file mode 100644
index 00000000000..74a5e4df8e2
--- /dev/null
+++ b/tests/components/conversation/test_trigger.py
@@ -0,0 +1,167 @@
+"""Test conversation triggers."""
+import pytest
+
+from homeassistant.core import HomeAssistant
+from homeassistant.setup import async_setup_component
+
+from tests.common import async_mock_service
+
+
+@pytest.fixture
+def calls(hass):
+    """Track calls to a mock service."""
+    return async_mock_service(hass, "test", "automation")
+
+
+@pytest.fixture(autouse=True)
+async def setup_comp(hass):
+    """Initialize components."""
+    assert await async_setup_component(hass, "homeassistant", {})
+    assert await async_setup_component(hass, "conversation", {})
+
+
+async def test_if_fires_on_event(hass: HomeAssistant, calls, setup_comp) -> None:
+    """Test the firing of events."""
+    assert await async_setup_component(
+        hass,
+        "automation",
+        {
+            "automation": {
+                "trigger": {
+                    "platform": "conversation",
+                    "command": [
+                        "Hey yo",
+                        "Ha ha ha",
+                    ],
+                },
+                "action": {
+                    "service": "test.automation",
+                    "data_template": {"data": "{{ trigger }}"},
+                },
+            }
+        },
+    )
+
+    await hass.services.async_call(
+        "conversation",
+        "process",
+        {
+            "text": "Ha ha ha",
+        },
+        blocking=True,
+    )
+
+    await hass.async_block_till_done()
+    assert len(calls) == 1
+    assert calls[0].data["data"] == {
+        "alias": None,
+        "id": "0",
+        "idx": "0",
+        "platform": "conversation",
+        "sentence": "Ha ha ha",
+    }
+
+
+async def test_same_trigger_multiple_sentences(
+    hass: HomeAssistant, calls, setup_comp
+) -> None:
+    """Test matching of multiple sentences from the same trigger."""
+    assert await async_setup_component(
+        hass,
+        "automation",
+        {
+            "automation": {
+                "trigger": {
+                    "platform": "conversation",
+                    "command": ["hello", "hello[ world]"],
+                },
+                "action": {
+                    "service": "test.automation",
+                    "data_template": {"data": "{{ trigger }}"},
+                },
+            }
+        },
+    )
+
+    await hass.services.async_call(
+        "conversation",
+        "process",
+        {
+            "text": "hello",
+        },
+        blocking=True,
+    )
+
+    # Only triggers once
+    await hass.async_block_till_done()
+    assert len(calls) == 1
+    assert calls[0].data["data"] == {
+        "alias": None,
+        "id": "0",
+        "idx": "0",
+        "platform": "conversation",
+        "sentence": "hello",
+    }
+
+
+async def test_same_sentence_multiple_triggers(
+    hass: HomeAssistant, calls, setup_comp
+) -> None:
+    """Test use of the same sentence in multiple triggers."""
+    assert await async_setup_component(
+        hass,
+        "automation",
+        {
+            "automation": [
+                {
+                    "trigger": {
+                        "id": "trigger1",
+                        "platform": "conversation",
+                        "command": [
+                            "hello",
+                        ],
+                    },
+                    "action": {
+                        "service": "test.automation",
+                        "data_template": {"data": "{{ trigger }}"},
+                    },
+                },
+                {
+                    "trigger": {
+                        "id": "trigger2",
+                        "platform": "conversation",
+                        "command": [
+                            "hello[ world]",
+                        ],
+                    },
+                    "action": {
+                        "service": "test.automation",
+                        "data_template": {"data": "{{ trigger }}"},
+                    },
+                },
+            ],
+        },
+    )
+
+    await hass.services.async_call(
+        "conversation",
+        "process",
+        {
+            "text": "hello",
+        },
+        blocking=True,
+    )
+
+    await hass.async_block_till_done()
+    assert len(calls) == 2
+
+    # The calls may come in any order
+    call_datas: set[tuple[str, str, str]] = set()
+    for call in calls:
+        call_data = call.data["data"]
+        call_datas.add((call_data["id"], call_data["platform"], call_data["sentence"]))
+
+    assert call_datas == {
+        ("trigger1", "conversation", "hello"),
+        ("trigger2", "conversation", "hello"),
+    }