Irrsee is a lake in the Salzkammergut, Austria, located at 47°54′44″N 13°18′25″E / 47.91222°N 13.30694°E / 47.91222; 13.30694.

Its surface is approximately 3.5 km2 (1.4 sq mi) and its maximum depth is 32 metres.

It is a popular tourist destination, also thanks to the warmest water temperature of all lakes in Salzkammergut.

It is drained by the Zeller Ache towards the Mondsee.

This Upper Austria location article is a stub.