Moosomin Lake, also known as Moosomin Reservoir, is a man-made lake in south-eastern part of the Canadian province of Saskatchewan. Created by the damming of Pipestone Creek in 1954, Moosomin Lake is located about 10 kilometres (6.2 mi) south of the town of Moosomin and is in the Souris River watershed. The reservoir's uses include irrigation, water supply, and recreation. Moosomin Lake Regional Park is on lake's western shore.