The Pragser Wildsee, or Lake Prags, Lake Braies (Italian: Lago di Braies; German: Pragser Wildsee) is a natural lake in the Prags Dolomites in South Tyrol, Italy. It belongs to the municipality of Prags which is located in the Prags Valley.

During World War II, it was the destination of the transport of concentration camp inmates to Tyrol.

While the lake earned the nickname "Pearl of the Alps" due to its increasing popularity among tourists, tourism had become excessive as of 2020, with 17,000 people visiting the area on a single summer day. As of the summer 2023, vehicle access was restricted because of overtourism.