The Schwaltenweiher is a reservoir in the Ostallgäu foothills of the Alps in Bavaria, Germany.

It lies 14 km (8.7 mi) from the Allgäu Alps between the towns of Seeg and Rückholz.

Maximilian I, Holy Roman Emperor set aside the lake in 1514 for fishing and hunting waterfowl.

His neighbouring Schloss Falkenberg (at what is now Goldhasen am Westufer) was destroyed by Imperial troops during the Thirty Years' War to prevent it falling into Swedish hands.

Notable guests there have been Theodor Heuss, Horst Köhler and Theo Waigel.