Mud Lake is an unorganized territory located in Marshall County, Minnesota, United States.

[1] In all censuses since 2000, the unorganized territory recorded a population of 0.

[2] Mud Lake was organized as Mud Lake Township, and named for a former lake that has since been drained.

[3] According to the United States Census Bureau, the unorganized territory has a total area of 36.0 square miles (93 km2), of which 31.3 square miles (81 km2) is land and 4.7 square miles (12 km2) (13.03%) is water.

As of the census[4] of 2000, there were no people living in the unorganized territory.