diff --git a/.strict-typing b/.strict-typing
index 6820472085a..5703c82fe93 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -187,6 +187,7 @@ homeassistant.components.logger.*
 homeassistant.components.lookin.*
 homeassistant.components.luftdaten.*
 homeassistant.components.mailbox.*
+homeassistant.components.mastodon.*
 homeassistant.components.matter.*
 homeassistant.components.media_player.*
 homeassistant.components.media_source.*
diff --git a/homeassistant/components/mastodon/__init__.py b/homeassistant/components/mastodon/__init__.py
index 123d23afb80..6a9f074a9ba 100644
--- a/homeassistant/components/mastodon/__init__.py
+++ b/homeassistant/components/mastodon/__init__.py
@@ -1 +1 @@
-"""The mastodon component."""
+"""The Mastodon integration."""
diff --git a/homeassistant/components/mastodon/const.py b/homeassistant/components/mastodon/const.py
new file mode 100644
index 00000000000..6fe9552f991
--- /dev/null
+++ b/homeassistant/components/mastodon/const.py
@@ -0,0 +1,9 @@
+"""Constants for the Mastodon integration."""
+
+import logging
+from typing import Final
+
+LOGGER = logging.getLogger(__name__)
+
+CONF_BASE_URL: Final = "base_url"
+DEFAULT_URL: Final = "https://mastodon.social"
diff --git a/homeassistant/components/mastodon/notify.py b/homeassistant/components/mastodon/notify.py
index 058137393f5..8f259bc3433 100644
--- a/homeassistant/components/mastodon/notify.py
+++ b/homeassistant/components/mastodon/notify.py
@@ -1,5 +1,7 @@
 """Mastodon platform for notify component."""
-import logging
+from __future__ import annotations
+
+from typing import Any
 
 from mastodon import Mastodon
 from mastodon.Mastodon import MastodonAPIError, MastodonUnauthorizedError
@@ -7,13 +9,11 @@ import voluptuous as vol
 
 from homeassistant.components.notify import PLATFORM_SCHEMA, BaseNotificationService
 from homeassistant.const import CONF_ACCESS_TOKEN, CONF_CLIENT_ID, CONF_CLIENT_SECRET
-import homeassistant.helpers.config_validation as cv
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import config_validation as cv
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
-_LOGGER = logging.getLogger(__name__)
-
-CONF_BASE_URL = "base_url"
-
-DEFAULT_URL = "https://mastodon.social"
+from .const import CONF_BASE_URL, DEFAULT_URL, LOGGER
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
     {
@@ -25,7 +25,11 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 )
 
 
-def get_service(hass, config, discovery_info=None):
+def get_service(
+    hass: HomeAssistant,
+    config: ConfigType,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> MastodonNotificationService | None:
     """Get the Mastodon notification service."""
     client_id = config.get(CONF_CLIENT_ID)
     client_secret = config.get(CONF_CLIENT_SECRET)
@@ -41,7 +45,7 @@ def get_service(hass, config, discovery_info=None):
         )
         mastodon.account_verify_credentials()
     except MastodonUnauthorizedError:
-        _LOGGER.warning("Authentication failed")
+        LOGGER.warning("Authentication failed")
         return None
 
     return MastodonNotificationService(mastodon)
@@ -50,13 +54,13 @@ def get_service(hass, config, discovery_info=None):
 class MastodonNotificationService(BaseNotificationService):
     """Implement the notification service for Mastodon."""
 
-    def __init__(self, api):
+    def __init__(self, api: Mastodon) -> None:
         """Initialize the service."""
         self._api = api
 
-    def send_message(self, message="", **kwargs):
+    def send_message(self, message: str = "", **kwargs: Any) -> None:
         """Send a message to a user."""
         try:
             self._api.toot(message)
         except MastodonAPIError:
-            _LOGGER.error("Unable to send message")
+            LOGGER.error("Unable to send message")
diff --git a/mypy.ini b/mypy.ini
index 1076f4d5e63..3f439f18839 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1624,6 +1624,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.mastodon.*]
+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.matter.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true