Altheim is a town in eastern Austria.

It is situated within the District of Braunau am Inn in the traditional region of Innviertel in the state of Upper Austria.

In 1985 archaeologists discovered the ruins of a Roman villa in farmland just outside Altheim.

In the town there is a Roman museum dedicated to these findings, the Ochzethaus Archived 2009-03-14 at the Wayback Machine.

This Upper Austria location article is a stub.