diff --git a/.strict-typing b/.strict-typing
index df0c0168a9e..df85d61c4a9 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -106,6 +106,7 @@ homeassistant.components.systemmonitor.*
 homeassistant.components.tag.*
 homeassistant.components.tcp.*
 homeassistant.components.tile.*
+homeassistant.components.tradfri.*
 homeassistant.components.tts.*
 homeassistant.components.upcloud.*
 homeassistant.components.uptime.*
diff --git a/homeassistant/components/tradfri/config_flow.py b/homeassistant/components/tradfri/config_flow.py
index 1a6ae8706f2..e45bd36753f 100644
--- a/homeassistant/components/tradfri/config_flow.py
+++ b/homeassistant/components/tradfri/config_flow.py
@@ -1,5 +1,8 @@
 """Config flow for Tradfri."""
+from __future__ import annotations
+
 import asyncio
+from typing import Any
 from uuid import uuid4
 
 import async_timeout
@@ -8,6 +11,9 @@ from pytradfri.api.aiocoap_api import APIFactory
 import voluptuous as vol
 
 from homeassistant import config_entries
+from homeassistant.core import HomeAssistant
+from homeassistant.data_entry_flow import FlowResult
+from homeassistant.helpers.typing import DiscoveryInfoType
 
 from .const import (
     CONF_GATEWAY_ID,
@@ -23,7 +29,7 @@ from .const import (
 class AuthError(Exception):
     """Exception if authentication occurs."""
 
-    def __init__(self, code):
+    def __init__(self, code: str) -> None:
         """Initialize exception."""
         super().__init__()
         self.code = code
@@ -34,18 +40,22 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
 
     VERSION = 1
 
-    def __init__(self):
+    def __init__(self) -> None:
         """Initialize flow."""
         self._host = None
         self._import_groups = False
 
-    async def async_step_user(self, user_input=None):
+    async def async_step_user(
+        self, user_input: dict[str, Any] | None = None
+    ) -> FlowResult:
         """Handle a flow initialized by the user."""
         return await self.async_step_auth()
 
-    async def async_step_auth(self, user_input=None):
+    async def async_step_auth(
+        self, user_input: dict[str, Any] | None = None
+    ) -> FlowResult:
         """Handle the authentication with a gateway."""
-        errors = {}
+        errors: dict[str, str] = {}
 
         if user_input is not None:
             host = user_input.get(CONF_HOST, self._host)
@@ -82,7 +92,7 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
             step_id="auth", data_schema=vol.Schema(fields), errors=errors
         )
 
-    async def async_step_homekit(self, discovery_info):
+    async def async_step_homekit(self, discovery_info: DiscoveryInfoType) -> FlowResult:
         """Handle homekit discovery."""
         await self.async_set_unique_id(discovery_info["properties"]["id"])
         self._abort_if_unique_id_configured({CONF_HOST: discovery_info["host"]})
@@ -104,7 +114,7 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
         self._host = host
         return await self.async_step_auth()
 
-    async def async_step_import(self, user_input):
+    async def async_step_import(self, user_input: dict[str, Any]) -> FlowResult:
         """Import a config entry."""
         self._async_abort_entries_match({CONF_HOST: user_input["host"]})
 
@@ -131,7 +141,7 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
             self._host = user_input["host"]
             return await self.async_step_auth()
 
-    async def _entry_from_data(self, data):
+    async def _entry_from_data(self, data: dict[str, Any]) -> FlowResult:
         """Create an entry from data."""
         host = data[CONF_HOST]
         gateway_id = data[CONF_GATEWAY_ID]
@@ -154,7 +164,9 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
         return self.async_create_entry(title=host, data=data)
 
 
-async def authenticate(hass, host, security_code):
+async def authenticate(
+    hass: HomeAssistant, host: str, security_code: str
+) -> dict[str, str | bool]:
     """Authenticate with a Tradfri hub."""
 
     identity = uuid4().hex
@@ -174,7 +186,9 @@ async def authenticate(hass, host, security_code):
     return await get_gateway_info(hass, host, identity, key)
 
 
-async def get_gateway_info(hass, host, identity, key):
+async def get_gateway_info(
+    hass: HomeAssistant, host: str, identity: str, key: str
+) -> dict[str, str | bool]:
     """Return info for the gateway."""
 
     try:
diff --git a/mypy.ini b/mypy.ini
index b1b2657aac9..cec6e51d58e 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1177,6 +1177,17 @@ no_implicit_optional = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.tradfri.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+no_implicit_optional = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.tts.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true