“Team Fortress 2 Mobile” just dropped.

Official Valve mobile apps (like the Steam app or Steam Link) explicitly list "Valve Corporation" as the developer.

This isn’t a native mobile port, but it’s the only official way to play the real TF2 on Android hardware—and the experience is flawless when your network conditions are good.

Because TF2 relies heavily on precise mouse-and-keyboard inputs, complex physics, and Source Engine network infrastructure, porting the entire game directly to mobile architecture is a massive technical hurdle that Valve has not officially undertaken. Watch Out for Google Play Store Scams

Use a Bluetooth controller (like an Xbox or PS5 controller) paired to your Android phone for the best experience.

As of this writing, That said, there is a new development that has the community buzzing.

Some rumors suggest Valve is working on a new Team Fortress game from the ground up, but that project is believed to be at least five years away from launching. This timeline suggests that if a new game is being made, it would be a separate title rather than a direct mobile port of the original TF2.