Wildsee may refer to the following lakes:
- Austria
- Wildsee (Seefeld), a lake near Seefeld in the Northern Limestone Alps, Tyrol
- Wildsee (Fieberbrunn), a lake in the Kitzbühel Alps near Fieberbrunn, Tyrol
- Germany
- Wildsee (Kaltenbronn), a lake near Gernsbach and Bad Wildbad in the Northern Black Forest, Baden-Württemberg
- Wildsee (Ruhestein), a lake near Baiersbronn in the Northern Black Forest, Baden-Württemberg
- Italy
- Pragser Wildsee, a lake in the Prags Dolomites in South Tyrol
- Switzerland
- Wildsee (Pizol), a lake in the Pizol area in the canton of St. Gallen