diff --git a/homeassistant/components/oasa_telematics/sensor.py b/homeassistant/components/oasa_telematics/sensor.py
index 47bdd24d192..3cb624190e7 100644
--- a/homeassistant/components/oasa_telematics/sensor.py
+++ b/homeassistant/components/oasa_telematics/sensor.py
@@ -127,7 +127,7 @@ class OASATelematicsSensor(SensorEntity):
         """Icon to use in the frontend, if any."""
         return ICON
 
-    def update(self):
+    def update(self) -> None:
         """Get the latest data from OASA API and update the states."""
         self.data.update()
         self._times = self.data.info
diff --git a/homeassistant/components/obihai/sensor.py b/homeassistant/components/obihai/sensor.py
index 1b1dc339af1..cff4e6232e7 100644
--- a/homeassistant/components/obihai/sensor.py
+++ b/homeassistant/components/obihai/sensor.py
@@ -146,7 +146,7 @@ class ObihaiServiceSensors(SensorEntity):
             return "mdi:restart-alert"
         return "mdi:phone"
 
-    def update(self):
+    def update(self) -> None:
         """Update the sensor."""
         services = self._pyobihai.get_state()
 
diff --git a/homeassistant/components/oem/climate.py b/homeassistant/components/oem/climate.py
index 298ae965e17..3f0110699eb 100644
--- a/homeassistant/components/oem/climate.py
+++ b/homeassistant/components/oem/climate.py
@@ -1,6 +1,8 @@
 """OpenEnergyMonitor Thermostat Support."""
 from __future__ import annotations
 
+from typing import Any
+
 from oemthermostat import Thermostat
 import requests
 import voluptuous as vol
@@ -122,12 +124,12 @@ class ThermostatDevice(ClimateEntity):
         elif hvac_mode == HVACMode.OFF:
             self.thermostat.mode = 0
 
-    def set_temperature(self, **kwargs):
+    def set_temperature(self, **kwargs: Any) -> None:
         """Set the temperature."""
         temp = kwargs.get(ATTR_TEMPERATURE)
         self.thermostat.setpoint = temp
 
-    def update(self):
+    def update(self) -> None:
         """Update local state."""
         self._setpoint = self.thermostat.setpoint
         self._temperature = self.thermostat.temperature
diff --git a/homeassistant/components/ohmconnect/sensor.py b/homeassistant/components/ohmconnect/sensor.py
index 09105984a31..3d9dbd78419 100644
--- a/homeassistant/components/ohmconnect/sensor.py
+++ b/homeassistant/components/ohmconnect/sensor.py
@@ -70,7 +70,7 @@ class OhmconnectSensor(SensorEntity):
         return {"Address": self._data.get("address"), "ID": self._ohmid}
 
     @Throttle(MIN_TIME_BETWEEN_UPDATES)
-    def update(self):
+    def update(self) -> None:
         """Get the latest data from OhmConnect."""
         try:
             url = f"https://login.ohmconnect.com/verify-ohm-hour/{self._ohmid}"
diff --git a/homeassistant/components/ombi/sensor.py b/homeassistant/components/ombi/sensor.py
index 9152af0f1bf..90410ea8da2 100644
--- a/homeassistant/components/ombi/sensor.py
+++ b/homeassistant/components/ombi/sensor.py
@@ -45,7 +45,7 @@ class OmbiSensor(SensorEntity):
 
         self._attr_name = f"Ombi {description.name}"
 
-    def update(self):
+    def update(self) -> None:
         """Update the sensor."""
         try:
             sensor_type = self.entity_description.key
diff --git a/homeassistant/components/onkyo/media_player.py b/homeassistant/components/onkyo/media_player.py
index 381f48b0b16..82f662e1bad 100644
--- a/homeassistant/components/onkyo/media_player.py
+++ b/homeassistant/components/onkyo/media_player.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 import eiscp
 from eiscp import eISCP
@@ -295,7 +296,7 @@ class OnkyoDevice(MediaPlayerEntity):
         _LOGGER.debug("Result for %s: %s", command, result)
         return result
 
-    def update(self):
+    def update(self) -> None:
         """Get the latest state from the device."""
         status = self.command("system-power query")
 
@@ -396,11 +397,11 @@ class OnkyoDevice(MediaPlayerEntity):
         """Return device specific state attributes."""
         return self._attributes
 
-    def turn_off(self):
+    def turn_off(self) -> None:
         """Turn the media player off."""
         self.command("system-power standby")
 
-    def set_volume_level(self, volume):
+    def set_volume_level(self, volume: float) -> None:
         """
         Set volume level, input is range 0..1.
 
@@ -414,32 +415,32 @@ class OnkyoDevice(MediaPlayerEntity):
             f"volume {int(volume * (self._max_volume / 100) * self._receiver_max_volume)}"
         )
 
-    def volume_up(self):
+    def volume_up(self) -> None:
         """Increase volume by 1 step."""
         self.command("volume level-up")
 
-    def volume_down(self):
+    def volume_down(self) -> None:
         """Decrease volume by 1 step."""
         self.command("volume level-down")
 
-    def mute_volume(self, mute):
+    def mute_volume(self, mute: bool) -> None:
         """Mute (true) or unmute (false) media player."""
         if mute:
             self.command("audio-muting on")
         else:
             self.command("audio-muting off")
 
-    def turn_on(self):
+    def turn_on(self) -> None:
         """Turn the media player on."""
         self.command("system-power on")
 
-    def select_source(self, source):
+    def select_source(self, source: str) -> None:
         """Set the input source."""
         if source in self._source_list:
             source = self._reverse_mapping[source]
         self.command(f"input-selector {source}")
 
-    def play_media(self, media_type, media_id, **kwargs):
+    def play_media(self, media_type: str, media_id: str, **kwargs: Any) -> None:
         """Play radio station by preset number."""
         source = self._reverse_mapping[self._current_source]
         if media_type.lower() == "radio" and source in DEFAULT_PLAYABLE_SOURCES:
@@ -506,7 +507,7 @@ class OnkyoDeviceZone(OnkyoDevice):
         self._supports_volume = True
         super().__init__(receiver, sources, name, max_volume, receiver_max_volume)
 
-    def update(self):
+    def update(self) -> None:
         """Get the latest state from the device."""
         status = self.command(f"zone{self._zone}.power=query")
 
@@ -563,11 +564,11 @@ class OnkyoDeviceZone(OnkyoDevice):
             return SUPPORT_ONKYO
         return SUPPORT_ONKYO_WO_VOLUME
 
-    def turn_off(self):
+    def turn_off(self) -> None:
         """Turn the media player off."""
         self.command(f"zone{self._zone}.power=standby")
 
-    def set_volume_level(self, volume):
+    def set_volume_level(self, volume: float) -> None:
         """
         Set volume level, input is range 0..1.
 
@@ -581,26 +582,26 @@ class OnkyoDeviceZone(OnkyoDevice):
             f"zone{self._zone}.volume={int(volume * (self._max_volume / 100) * self._receiver_max_volume)}"
         )
 
-    def volume_up(self):
+    def volume_up(self) -> None:
         """Increase volume by 1 step."""
         self.command(f"zone{self._zone}.volume=level-up")
 
-    def volume_down(self):
+    def volume_down(self) -> None:
         """Decrease volume by 1 step."""
         self.command(f"zone{self._zone}.volume=level-down")
 
-    def mute_volume(self, mute):
+    def mute_volume(self, mute: bool) -> None:
         """Mute (true) or unmute (false) media player."""
         if mute:
             self.command(f"zone{self._zone}.muting=on")
         else:
             self.command(f"zone{self._zone}.muting=off")
 
-    def turn_on(self):
+    def turn_on(self) -> None:
         """Turn the media player on."""
         self.command(f"zone{self._zone}.power=on")
 
-    def select_source(self, source):
+    def select_source(self, source: str) -> None:
         """Set the input source."""
         if source in self._source_list:
             source = self._reverse_mapping[source]
diff --git a/homeassistant/components/onvif/binary_sensor.py b/homeassistant/components/onvif/binary_sensor.py
index cd9af1d83b5..2a7f23c61ee 100644
--- a/homeassistant/components/onvif/binary_sensor.py
+++ b/homeassistant/components/onvif/binary_sensor.py
@@ -82,7 +82,7 @@ class ONVIFBinarySensor(ONVIFBaseEntity, RestoreEntity, BinarySensorEntity):
             return event.value
         return self._attr_is_on
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Connect to dispatcher listening for entity data notifications."""
         self.async_on_remove(
             self.device.events.async_add_listener(self.async_write_ha_state)
diff --git a/homeassistant/components/onvif/sensor.py b/homeassistant/components/onvif/sensor.py
index b662dca1d5d..4ad4c11f175 100644
--- a/homeassistant/components/onvif/sensor.py
+++ b/homeassistant/components/onvif/sensor.py
@@ -81,7 +81,7 @@ class ONVIFSensor(ONVIFBaseEntity, RestoreSensor):
             return event.value
         return self._attr_native_value
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Connect to dispatcher listening for entity data notifications."""
         self.async_on_remove(
             self.device.events.async_add_listener(self.async_write_ha_state)
diff --git a/homeassistant/components/openerz/sensor.py b/homeassistant/components/openerz/sensor.py
index c83611a303c..4bfe11ee264 100644
--- a/homeassistant/components/openerz/sensor.py
+++ b/homeassistant/components/openerz/sensor.py
@@ -58,7 +58,7 @@ class OpenERZSensor(SensorEntity):
         """Return the state of the sensor."""
         return self._state
 
-    def update(self):
+    def update(self) -> None:
         """Fetch new state data for the sensor.
 
         This is the only method that should fetch new data for Home Assistant.
diff --git a/homeassistant/components/openevse/sensor.py b/homeassistant/components/openevse/sensor.py
index 3dcea4d0126..5bb469a3d99 100644
--- a/homeassistant/components/openevse/sensor.py
+++ b/homeassistant/components/openevse/sensor.py
@@ -118,7 +118,7 @@ class OpenEVSESensor(SensorEntity):
         self.entity_description = description
         self.charger = charger
 
-    def update(self):
+    def update(self) -> None:
         """Get the monitored data from the charger."""
         try:
             sensor_type = self.entity_description.key
diff --git a/homeassistant/components/openhardwaremonitor/sensor.py b/homeassistant/components/openhardwaremonitor/sensor.py
index f21126d01a0..70dbbd38fc8 100644
--- a/homeassistant/components/openhardwaremonitor/sensor.py
+++ b/homeassistant/components/openhardwaremonitor/sensor.py
@@ -91,7 +91,7 @@ class OpenHardwareMonitorDevice(SensorEntity):
         """In some locales a decimal numbers uses ',' instead of '.'."""
         return string.replace(",", ".")
 
-    def update(self):
+    def update(self) -> None:
         """Update the device from a new JSON object."""
         self._data.update()
 
diff --git a/homeassistant/components/openhome/media_player.py b/homeassistant/components/openhome/media_player.py
index b6a0b549c40..d528bb8dad4 100644
--- a/homeassistant/components/openhome/media_player.py
+++ b/homeassistant/components/openhome/media_player.py
@@ -19,6 +19,7 @@ from homeassistant.components.media_player import (
     MediaPlayerEntityFeature,
 )
 from homeassistant.components.media_player.browse_media import (
+    BrowseMedia,
     async_process_play_media_url,
 )
 from homeassistant.components.media_player.const import MEDIA_TYPE_MUSIC
@@ -133,7 +134,7 @@ class OpenhomeDevice(MediaPlayerEntity):
         """Device is available."""
         return self._available
 
-    async def async_update(self):
+    async def async_update(self) -> None:
         """Update state of device."""
         try:
             self._in_standby = await self._device.is_in_standby()
@@ -195,17 +196,19 @@ class OpenhomeDevice(MediaPlayerEntity):
             self._available = False
 
     @catch_request_errors()
-    async def async_turn_on(self):
+    async def async_turn_on(self) -> None:
         """Bring device out of standby."""
         await self._device.set_standby(False)
 
     @catch_request_errors()
-    async def async_turn_off(self):
+    async def async_turn_off(self) -> None:
         """Put device in standby."""
         await self._device.set_standby(True)
 
     @catch_request_errors()
-    async def async_play_media(self, media_type, media_id, **kwargs):
+    async def async_play_media(
+        self, media_type: str, media_id: str, **kwargs: Any
+    ) -> None:
         """Send the play_media command to the media player."""
         if media_source.is_media_source_id(media_id):
             media_type = MEDIA_TYPE_MUSIC
@@ -228,32 +231,32 @@ class OpenhomeDevice(MediaPlayerEntity):
         await self._device.play_media(track_details)
 
     @catch_request_errors()
-    async def async_media_pause(self):
+    async def async_media_pause(self) -> None:
         """Send pause command."""
         await self._device.pause()
 
     @catch_request_errors()
-    async def async_media_stop(self):
+    async def async_media_stop(self) -> None:
         """Send stop command."""
         await self._device.stop()
 
     @catch_request_errors()
-    async def async_media_play(self):
+    async def async_media_play(self) -> None:
         """Send play command."""
         await self._device.play()
 
     @catch_request_errors()
-    async def async_media_next_track(self):
+    async def async_media_next_track(self) -> None:
         """Send next track command."""
         await self._device.skip(1)
 
     @catch_request_errors()
-    async def async_media_previous_track(self):
+    async def async_media_previous_track(self) -> None:
         """Send previous track command."""
         await self._device.skip(-1)
 
     @catch_request_errors()
-    async def async_select_source(self, source):
+    async def async_select_source(self, source: str) -> None:
         """Select input source."""
         await self._device.set_source(self._source_index[source])
 
@@ -325,26 +328,28 @@ class OpenhomeDevice(MediaPlayerEntity):
         return self._volume_muted
 
     @catch_request_errors()
-    async def async_volume_up(self):
+    async def async_volume_up(self) -> None:
         """Volume up media player."""
         await self._device.increase_volume()
 
     @catch_request_errors()
-    async def async_volume_down(self):
+    async def async_volume_down(self) -> None:
         """Volume down media player."""
         await self._device.decrease_volume()
 
     @catch_request_errors()
-    async def async_set_volume_level(self, volume):
+    async def async_set_volume_level(self, volume: float) -> None:
         """Set volume level, range 0..1."""
         await self._device.set_volume(int(volume * 100))
 
     @catch_request_errors()
-    async def async_mute_volume(self, mute):
+    async def async_mute_volume(self, mute: bool) -> None:
         """Mute (true) or unmute (false) media player."""
         await self._device.set_mute(mute)
 
-    async def async_browse_media(self, media_content_type=None, media_content_id=None):
+    async def async_browse_media(
+        self, media_content_type: str | None = None, media_content_id: str | None = None
+    ) -> BrowseMedia:
         """Implement the websocket media browsing helper."""
         return await media_source.async_browse_media(
             self.hass,
diff --git a/homeassistant/components/opentherm_gw/binary_sensor.py b/homeassistant/components/opentherm_gw/binary_sensor.py
index 083fb103481..194e047e50e 100644
--- a/homeassistant/components/opentherm_gw/binary_sensor.py
+++ b/homeassistant/components/opentherm_gw/binary_sensor.py
@@ -102,14 +102,14 @@ class OpenThermBinarySensor(BinarySensorEntity):
         self._friendly_name = friendly_name_format.format(gw_dev.name)
         self._unsub_updates = None
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Subscribe to updates from the component."""
         _LOGGER.debug("Added OpenTherm Gateway binary sensor %s", self._friendly_name)
         self._unsub_updates = async_dispatcher_connect(
             self.hass, self._gateway.update_signal, self.receive_report
         )
 
-    async def async_will_remove_from_hass(self):
+    async def async_will_remove_from_hass(self) -> None:
         """Unsubscribe from updates from the component."""
         _LOGGER.debug(
             "Removing OpenTherm Gateway binary sensor %s", self._friendly_name
diff --git a/homeassistant/components/opentherm_gw/climate.py b/homeassistant/components/opentherm_gw/climate.py
index a805cbacba0..fba28138f42 100644
--- a/homeassistant/components/opentherm_gw/climate.py
+++ b/homeassistant/components/opentherm_gw/climate.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 from pyotgw import vars as gw_vars
 
@@ -101,7 +102,7 @@ class OpenThermClimate(ClimateEntity):
         self.temporary_ovrd_mode = entry.options[CONF_TEMPORARY_OVRD_MODE]
         self.async_write_ha_state()
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Connect to the OpenTherm Gateway device."""
         _LOGGER.debug("Added OpenTherm Gateway climate device %s", self.friendly_name)
         self._unsub_updates = async_dispatcher_connect(
@@ -111,7 +112,7 @@ class OpenThermClimate(ClimateEntity):
             self.hass, self._gateway.options_update_signal, self.update_options
         )
 
-    async def async_will_remove_from_hass(self):
+    async def async_will_remove_from_hass(self) -> None:
         """Unsubscribe from updates from the component."""
         _LOGGER.debug("Removing OpenTherm Gateway climate %s", self.friendly_name)
         self._unsub_options()
@@ -261,11 +262,11 @@ class OpenThermClimate(ClimateEntity):
         """Available preset modes to set."""
         return []
 
-    def set_preset_mode(self, preset_mode):
+    def set_preset_mode(self, preset_mode: str) -> None:
         """Set the preset mode."""
         _LOGGER.warning("Changing preset mode is not supported")
 
-    async def async_set_temperature(self, **kwargs):
+    async def async_set_temperature(self, **kwargs: Any) -> None:
         """Set new target temperature."""
         if ATTR_TEMPERATURE in kwargs:
             temp = float(kwargs[ATTR_TEMPERATURE])
diff --git a/homeassistant/components/opentherm_gw/sensor.py b/homeassistant/components/opentherm_gw/sensor.py
index 5eea4fca099..67b4eb138dd 100644
--- a/homeassistant/components/opentherm_gw/sensor.py
+++ b/homeassistant/components/opentherm_gw/sensor.py
@@ -106,14 +106,14 @@ class OpenThermSensor(SensorEntity):
         self._friendly_name = friendly_name_format.format(gw_dev.name)
         self._unsub_updates = None
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Subscribe to updates from the component."""
         _LOGGER.debug("Added OpenTherm Gateway sensor %s", self._friendly_name)
         self._unsub_updates = async_dispatcher_connect(
             self.hass, self._gateway.update_signal, self.receive_report
         )
 
-    async def async_will_remove_from_hass(self):
+    async def async_will_remove_from_hass(self) -> None:
         """Unsubscribe from updates from the component."""
         _LOGGER.debug("Removing OpenTherm Gateway sensor %s", self._friendly_name)
         self._unsub_updates()
diff --git a/homeassistant/components/opple/light.py b/homeassistant/components/opple/light.py
index 25bcf821fc9..80d0f8630dc 100644
--- a/homeassistant/components/opple/light.py
+++ b/homeassistant/components/opple/light.py
@@ -69,7 +69,7 @@ class OppleLight(LightEntity):
         self._color_temp = None
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Return True if light is available."""
         return self._device.is_online
 
diff --git a/homeassistant/components/oru/sensor.py b/homeassistant/components/oru/sensor.py
index b31defd7171..5d99e782fdd 100644
--- a/homeassistant/components/oru/sensor.py
+++ b/homeassistant/components/oru/sensor.py
@@ -75,7 +75,7 @@ class CurrentEnergyUsageSensor(SensorEntity):
         """Return the state of the sensor."""
         return self._state
 
-    def update(self):
+    def update(self) -> None:
         """Fetch new state data for the sensor."""
         try:
             last_read = self.meter.last_read()
diff --git a/homeassistant/components/orvibo/switch.py b/homeassistant/components/orvibo/switch.py
index b526b9057bd..9e86d3787af 100644
--- a/homeassistant/components/orvibo/switch.py
+++ b/homeassistant/components/orvibo/switch.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 from orvibo.s20 import S20, S20Exception, discover
 import voluptuous as vol
@@ -93,21 +94,21 @@ class S20Switch(SwitchEntity):
         """Return true if device is on."""
         return self._state
 
-    def update(self):
+    def update(self) -> None:
         """Update device state."""
         try:
             self._state = self._s20.on
         except self._exc:
             _LOGGER.exception("Error while fetching S20 state")
 
-    def turn_on(self, **kwargs):
+    def turn_on(self, **kwargs: Any) -> None:
         """Turn the device on."""
         try:
             self._s20.on = True
         except self._exc:
             _LOGGER.exception("Error while turning on S20")
 
-    def turn_off(self, **kwargs):
+    def turn_off(self, **kwargs: Any) -> None:
         """Turn the device off."""
         try:
             self._s20.on = False
diff --git a/homeassistant/components/otp/sensor.py b/homeassistant/components/otp/sensor.py
index ff5a2965795..499c9b129f1 100644
--- a/homeassistant/components/otp/sensor.py
+++ b/homeassistant/components/otp/sensor.py
@@ -53,7 +53,7 @@ class TOTPSensor(SensorEntity):
         self._state = None
         self._next_expiration = None
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Handle when an entity is about to be added to Home Assistant."""
         self._call_loop()
 
diff --git a/homeassistant/components/owntracks/device_tracker.py b/homeassistant/components/owntracks/device_tracker.py
index 5119168e7ae..70b8bde6de1 100644
--- a/homeassistant/components/owntracks/device_tracker.py
+++ b/homeassistant/components/owntracks/device_tracker.py
@@ -124,7 +124,7 @@ class OwnTracksEntity(TrackerEntity, RestoreEntity):
         """Return the device info."""
         return DeviceInfo(identifiers={(OT_DOMAIN, self._dev_id)}, name=self.name)
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Call when entity about to be added to Home Assistant."""
         await super().async_added_to_hass()