Lake of Gruyère is an artificial lake in the La Gruyère region of the Canton of Fribourg, Switzerland.
The reservoir was formed between the cities of Bulle and Fribourg, by building the Rossens Dam on the Sarine river in 1948. The arch dam has a height of 83 m and a crest length of 320 m. The reservoir filled in about four months after completion. The dam is operated by the Groupe E SA.
The remains of the castle of Pont and a chapel are located on the Ile d'Ogoz, one of the five islets in the lake.
Address 1647, Switzerland
Coordinates 46°39'58.132" N 7°5'56.489" E