Maltschacher See is a lake in Carinthia, Austria, 5 kilometers south-east of Feldkirchen in Kärnten.

The outflow from the lake feeds the Strußnigteich, a breeding ground where carps are grown, four kilometers southeast of the Maltschacher See.

[1] The lake originally had a dense belt of reeds and aquatic plants.

In 1975 the grass carp was introduced in the lake which destroyed both plants and reed belts.

[1] At the shore of the Maltschacher See is a campsite, a bungalow park and restaurants.