diff --git a/.strict-typing b/.strict-typing
index 84915e3f1b3..7d2bedc1a46 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -61,6 +61,7 @@ homeassistant.components.anthemav.*
 homeassistant.components.apcupsd.*
 homeassistant.components.aqualogic.*
 homeassistant.components.aseko_pool_live.*
+homeassistant.components.assist_pipeline.*
 homeassistant.components.asuswrt.*
 homeassistant.components.auth.*
 homeassistant.components.automation.*
diff --git a/homeassistant/components/assist_pipeline/pipeline.py b/homeassistant/components/assist_pipeline/pipeline.py
index 5e194b2a31f..5f47e55965c 100644
--- a/homeassistant/components/assist_pipeline/pipeline.py
+++ b/homeassistant/components/assist_pipeline/pipeline.py
@@ -179,7 +179,7 @@ class PipelineRun:
     tts_engine: str | None = None
     tts_options: dict | None = None
 
-    def __post_init__(self):
+    def __post_init__(self) -> None:
         """Set language for pipeline."""
         self.language = self.pipeline.language or self.hass.config.language
 
@@ -189,7 +189,7 @@ class PipelineRun:
         ):
             raise InvalidPipelineStagesError(self.start_stage, self.end_stage)
 
-    def start(self):
+    def start(self) -> None:
         """Emit run start event."""
         data = {
             "pipeline": self.pipeline.name,
@@ -200,7 +200,7 @@ class PipelineRun:
 
         self.event_callback(PipelineEvent(PipelineEventType.RUN_START, data))
 
-    def end(self):
+    def end(self) -> None:
         """Emit run end event."""
         self.event_callback(
             PipelineEvent(
@@ -349,7 +349,9 @@ class PipelineRun:
             )
         )
 
-        speech = conversation_result.response.speech.get("plain", {}).get("speech", "")
+        speech: str = conversation_result.response.speech.get("plain", {}).get(
+            "speech", ""
+        )
 
         return speech
 
@@ -453,7 +455,7 @@ class PipelineInput:
 
     conversation_id: str | None = None
 
-    async def execute(self):
+    async def execute(self) -> None:
         """Run pipeline."""
         self.run.start()
         current_stage = self.run.start_stage
@@ -496,7 +498,7 @@ class PipelineInput:
 
         self.run.end()
 
-    async def validate(self):
+    async def validate(self) -> None:
         """Validate pipeline input against start stage."""
         if self.run.start_stage == PipelineStage.STT:
             if self.stt_metadata is None:
@@ -524,7 +526,8 @@ class PipelineInput:
         prepare_tasks = []
 
         if start_stage_index <= PIPELINE_STAGE_ORDER.index(PipelineStage.STT):
-            prepare_tasks.append(self.run.prepare_speech_to_text(self.stt_metadata))
+            # self.stt_metadata can't be None or we'd raise above
+            prepare_tasks.append(self.run.prepare_speech_to_text(self.stt_metadata))  # type: ignore[arg-type]
 
         if start_stage_index <= PIPELINE_STAGE_ORDER.index(PipelineStage.INTENT):
             prepare_tasks.append(self.run.prepare_recognize_intent())
@@ -696,7 +699,7 @@ class PipelineStorageCollectionWebsocket(
         connection.send_result(msg["id"])
 
 
-async def async_setup_pipeline_store(hass):
+async def async_setup_pipeline_store(hass: HomeAssistant) -> None:
     """Set up the pipeline storage collection."""
     pipeline_store = PipelineStorageCollection(
         Store(hass, STORAGE_VERSION, STORAGE_KEY)
diff --git a/homeassistant/components/assist_pipeline/vad.py b/homeassistant/components/assist_pipeline/vad.py
index e86579b9750..ead3528fedc 100644
--- a/homeassistant/components/assist_pipeline/vad.py
+++ b/homeassistant/components/assist_pipeline/vad.py
@@ -48,14 +48,14 @@ class VoiceCommandSegmenter:
     _bytes_per_chunk: int = 480 * 2  # 16-bit samples
     _seconds_per_chunk: float = 0.03  # 30 ms
 
-    def __post_init__(self):
+    def __post_init__(self) -> None:
         """Initialize VAD."""
         self._vad = webrtcvad.Vad(self.vad_mode)
         self._bytes_per_chunk = self.vad_frames * 2
         self._seconds_per_chunk = self.vad_frames / _SAMPLE_RATE
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         """Reset all counters and state."""
         self._audio_buffer = b""
         self._speech_seconds_left = self.speech_seconds
diff --git a/homeassistant/components/assist_pipeline/websocket_api.py b/homeassistant/components/assist_pipeline/websocket_api.py
index c88f69f0bc8..ebc48f09bc6 100644
--- a/homeassistant/components/assist_pipeline/websocket_api.py
+++ b/homeassistant/components/assist_pipeline/websocket_api.py
@@ -1,7 +1,7 @@
 """Assist pipeline Websocket API."""
 import asyncio
 import audioop  # pylint: disable=deprecated-module
-from collections.abc import Callable
+from collections.abc import AsyncGenerator, Callable
 import logging
 from typing import Any
 
@@ -114,7 +114,7 @@ async def websocket_run(
         audio_queue: "asyncio.Queue[bytes]" = asyncio.Queue()
         incoming_sample_rate = msg["input"]["sample_rate"]
 
-        async def stt_stream():
+        async def stt_stream() -> AsyncGenerator[bytes, None]:
             state = None
             segmenter = VoiceCommandSegmenter()
 
@@ -129,7 +129,11 @@ async def websocket_run(
 
                 yield chunk
 
-        def handle_binary(_hass, _connection, data: bytes):
+        def handle_binary(
+            _hass: HomeAssistant,
+            _connection: websocket_api.ActiveConnection,
+            data: bytes,
+        ) -> None:
             # Forward to STT audio stream
             audio_queue.put_nowait(data)
 
diff --git a/mypy.ini b/mypy.ini
index 389e639a1a4..6c16e661ee2 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -371,6 +371,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.assist_pipeline.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.asuswrt.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true