Lake Silvaplana (; ) is a lake in the Upper-Engadine valley of Grisons, Switzerland. It takes its name from the village of Silvaplana. The lake is also connected to the nearby Lej da Champfèr. Together with its larger neighbour, Lake Sils, it is among the largest lakes of the Grisons. Lake Silvaplana is overlooked by several mountains over 3,000 metres, notably Piz Corvatsch, Piz Julier and Piz Surlej. The lake's drainage basin culminates at Piz Corvatsch (3,451 m) and comprises several glaciers, the largest being the Vadret dal Tremoggia.