Irrsee
Irrsee
Location	Salzkammergut
Coordinates	47°54′44″N 13°18′25″E / 47.91222°N 13.30694°E / 47.91222; 13.30694
Primary outflows	Zeller Ache
Basin countries	Austria
Max. length	4.4 km (2.7 mi)
Max. width	1 km (0.62 mi)
Surface area	3.5 km2 (1.4 sq mi)
Max. depth	32 m (105 ft)
Surface elevation	553 m (1,814 ft)
Settlements	Zell am Moos

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.