diff --git a/homeassistant/components/mqtt/client.py b/homeassistant/components/mqtt/client.py
index d8bc0862d29..0091d2370a4 100644
--- a/homeassistant/components/mqtt/client.py
+++ b/homeassistant/components/mqtt/client.py
@@ -119,7 +119,7 @@ MAX_PACKETS_TO_READ = 500
 
 type SocketType = socket.socket | ssl.SSLSocket | mqtt.WebsocketWrapper | Any
 
-type SubscribePayloadType = str | bytes  # Only bytes if encoding is None
+type SubscribePayloadType = str | bytes | bytearray  # Only bytes if encoding is None
 
 
 def publish(
diff --git a/homeassistant/components/mqtt/switch.py b/homeassistant/components/mqtt/switch.py
index c90174e8a01..0a54bcdb378 100644
--- a/homeassistant/components/mqtt/switch.py
+++ b/homeassistant/components/mqtt/switch.py
@@ -91,7 +91,7 @@ class MqttSwitch(MqttEntity, SwitchEntity, RestoreEntity):
     _entity_id_format = switch.ENTITY_ID_FORMAT
 
     _optimistic: bool
-    _is_on_map: dict[str | bytes, bool | None]
+    _is_on_map: dict[str | bytes | bytearray, bool | None]
     _command_template: Callable[[PublishPayloadType], PublishPayloadType]
     _value_template: Callable[[ReceivePayloadType], ReceivePayloadType]
 
diff --git a/homeassistant/helpers/service_info/mqtt.py b/homeassistant/helpers/service_info/mqtt.py
index 6ffc981ced1..a5284807617 100644
--- a/homeassistant/helpers/service_info/mqtt.py
+++ b/homeassistant/helpers/service_info/mqtt.py
@@ -4,7 +4,7 @@ from dataclasses import dataclass
 
 from homeassistant.data_entry_flow import BaseServiceInfo
 
-type ReceivePayloadType = str | bytes
+type ReceivePayloadType = str | bytes | bytearray
 
 
 @dataclass(slots=True)