diff --git a/homeassistant/components/homekit_controller/connection.py b/homeassistant/components/homekit_controller/connection.py
index ef806cb52bc1..4a5a4953c4b8 100644
--- a/homeassistant/components/homekit_controller/connection.py
+++ b/homeassistant/components/homekit_controller/connection.py
@@ -641,7 +641,9 @@ class HKDevice:
         await self.async_add_new_entities()
 
     @callback
-    def async_entity_key_removed(self, entity_key: tuple[int, int | None, int | None]):
+    def async_entity_key_removed(
+        self, entity_key: tuple[int, int | None, int | None]
+    ) -> None:
         """Handle an entity being removed.
 
         Releases the entity from self.entities so it can be added again.
@@ -666,7 +668,7 @@ class HKDevice:
         self.char_factories.append(add_entities_cb)
         self._add_new_entities_for_char([add_entities_cb])
 
-    def _add_new_entities_for_char(self, handlers) -> None:
+    def _add_new_entities_for_char(self, handlers: list[AddCharacteristicCb]) -> None:
         for accessory in self.entity_map.accessories:
             for service in accessory.services:
                 for char in service.characteristics:
@@ -768,7 +770,7 @@ class HKDevice:
         """Request an debounced update from the accessory."""
         await self._debounced_update.async_call()
 
-    async def async_update(self, now=None):
+    async def async_update(self, now: datetime | None = None) -> None:
         """Poll state of all entities attached to this bridge/accessory."""
         if not self.pollable_characteristics:
             self.async_update_available_state()
diff --git a/homeassistant/components/homekit_controller/device_trigger.py b/homeassistant/components/homekit_controller/device_trigger.py
index fa4c1c171c2c..6dc97bf68211 100644
--- a/homeassistant/components/homekit_controller/device_trigger.py
+++ b/homeassistant/components/homekit_controller/device_trigger.py
@@ -115,7 +115,7 @@ class TriggerSource:
 
         trigger_callbacks.append(event_handler)
 
-        def async_remove_handler():
+        def async_remove_handler() -> None:
             trigger_callbacks.remove(event_handler)
 
         return async_remove_handler
@@ -215,7 +215,7 @@ async def async_setup_triggers_for_entry(
     conn: HKDevice = hass.data[KNOWN_DEVICES][hkid]
 
     @callback
-    def async_add_characteristic(service: Service):
+    def async_add_characteristic(service: Service) -> bool:
         aid = service.accessory.aid
         service_type = service.type
 
@@ -257,7 +257,9 @@ def async_get_or_create_trigger_source(
     return source
 
 
-def async_fire_triggers(conn: HKDevice, events: dict[tuple[int, int], dict[str, Any]]):
+def async_fire_triggers(
+    conn: HKDevice, events: dict[tuple[int, int], dict[str, Any]]
+) -> None:
     """Process events generated by a HomeKit accessory into automation triggers."""
     trigger_sources: dict[str, TriggerSource] = conn.hass.data.get(TRIGGERS, {})
     if not trigger_sources:
diff --git a/homeassistant/components/homekit_controller/entity.py b/homeassistant/components/homekit_controller/entity.py
index ba0cad8d666b..496866299d63 100644
--- a/homeassistant/components/homekit_controller/entity.py
+++ b/homeassistant/components/homekit_controller/entity.py
@@ -109,7 +109,7 @@ class HomeKitEntity(Entity):
         self._accessory.async_entity_key_removed(self._entity_key)
 
     @callback
-    def _async_unsubscribe_chars(self):
+    def _async_unsubscribe_chars(self) -> None:
         """Handle unsubscribing from characteristics."""
         if self._char_subscription:
             self._char_subscription()
@@ -118,7 +118,7 @@ class HomeKitEntity(Entity):
         self._accessory.remove_watchable_characteristics(self.watchable_characteristics)
 
     @callback
-    def _async_subscribe_chars(self):
+    def _async_subscribe_chars(self) -> None:
         """Handle registering characteristics to watch and subscribe."""
         self._accessory.add_pollable_characteristics(self.pollable_characteristics)
         self._accessory.add_watchable_characteristics(self.watchable_characteristics)
diff --git a/homeassistant/components/homekit_controller/event.py b/homeassistant/components/homekit_controller/event.py
index 86046415e357..8f3d71682f16 100644
--- a/homeassistant/components/homekit_controller/event.py
+++ b/homeassistant/components/homekit_controller/event.py
@@ -72,7 +72,7 @@ class HomeKitEventEntity(BaseCharacteristicEntity, EventEntity):
         )
 
     @callback
-    def _handle_event(self):
+    def _handle_event(self) -> None:
         if self._char.value is None:
             # For IP backed devices the characteristic is marked as
             # pollable, but always returns None when polled