Laksjøen is a lake in Lierne Municipality in Trøndelag county, Norway. It has a surface area of 19.2 square kilometres (7.4 sq mi). The administrative center of Lierne, Sandvika, lies on the northern shore of the lake. The lake is fed by the lake Sandsjøen to the east, and the water exits the lake in the north and later joins the river Sanddøla which later joins the river Namsen.

• List of lakes in Norway