Granvinsvatnet is a lake in the Granvin area of Voss Municipality in Vestland county, Norway.

The 4.05-square-kilometre (1.56 sq mi) lake sits just north of the village of Eide.

The Joberg Tunnel along the northern part of this lake opened in September 2017.

The old Hardanger Line railway used to run along the west side of the lake.

This article related to a lake in Vestland in Norway is a stub.