Bjølsegrøvvatnet is a lake in the municipality of Kvam in Hordaland county, Norway. The 5.82-square-kilometre (2.25 sq mi) lake lies at an altitude of 880 metres (2,890 ft) above sea level in the mountains east of the Fyksesund fjord and northwest of the village of Ålvik. It has a dam on the southeastern tip of the lake to regulate the amount of water in it.