The Innviertel (literally German for the Inn quarter or district) is a traditional Austrian region south-east of the Inn river. It belongs to the state of Upper Austria and borders the German state of Bavaria.
The other three traditional quarters of Upper Austria are Hausruckviertel, Mühlviertel, and Traunviertel.
Innviertel spans the Austrian political districts of Schärding, Ried im Innkreis and Braunau am Inn.
Major towns in Innviertel include the district capitals Braunau am Inn, Ried im Innkreis and Schärding as well as Mattighofen and Altheim.