diff --git a/.strict-typing b/.strict-typing
index 783395ff926..4aa0a44c96d 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -345,6 +345,7 @@ homeassistant.components.trafikverket_camera.*
 homeassistant.components.trafikverket_ferry.*
 homeassistant.components.trafikverket_train.*
 homeassistant.components.trafikverket_weatherstation.*
+homeassistant.components.transmission.*
 homeassistant.components.trend.*
 homeassistant.components.tts.*
 homeassistant.components.twentemilieu.*
diff --git a/homeassistant/components/transmission/const.py b/homeassistant/components/transmission/const.py
index cb31d5a5aac..77d2baf7213 100644
--- a/homeassistant/components/transmission/const.py
+++ b/homeassistant/components/transmission/const.py
@@ -1,4 +1,10 @@
 """Constants for the Transmission Bittorent Client component."""
+from __future__ import annotations
+
+from collections.abc import Callable
+
+from transmission_rpc import Torrent
+
 DOMAIN = "transmission"
 
 SWITCH_TYPES = {"on_off": "Switch", "turtle_mode": "Turtle mode"}
@@ -8,7 +14,7 @@ ORDER_OLDEST_FIRST = "oldest_first"
 ORDER_BEST_RATIO_FIRST = "best_ratio_first"
 ORDER_WORST_RATIO_FIRST = "worst_ratio_first"
 
-SUPPORTED_ORDER_MODES = {
+SUPPORTED_ORDER_MODES: dict[str, Callable[[list[Torrent]], list[Torrent]]] = {
     ORDER_NEWEST_FIRST: lambda torrents: sorted(
         torrents, key=lambda t: t.date_added, reverse=True
     ),
diff --git a/homeassistant/components/transmission/coordinator.py b/homeassistant/components/transmission/coordinator.py
index 5fce7cae53d..a9cfc93eea0 100644
--- a/homeassistant/components/transmission/coordinator.py
+++ b/homeassistant/components/transmission/coordinator.py
@@ -163,4 +163,4 @@ class TransmissionDataUpdateCoordinator(DataUpdateCoordinator[SessionStats]):
         if self._session is None:
             return None
 
-        return self._session.alt_speed_enabled
+        return self._session.alt_speed_enabled  # type: ignore[no-any-return]
diff --git a/mypy.ini b/mypy.ini
index 0bc95fa5970..40d57a6b430 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -3212,6 +3212,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.transmission.*]
+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.trend.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true