Leech Lake is a lake located in north central Minnesota, United States. It is southeast of Bemidji, located mainly within the Leech Lake Indian Reservation, and completely within the Chippewa National Forest. It is used as a reservoir. The lake is the third largest in Minnesota, covering 102,947.83 acres (416.6151 km2) with 195 miles (314 km) of shoreline and has a maximum depth of 156 feet (48 m).

The Leech Lake Reservation is an Indian reservation located in the north-central Minnesota counties of Cass, Itasca, Beltrami, and Hubbard. The reservation forms the land base for the federally recognized Leech Lake Band of Ojibwe, one of six bands comprising the Minnesota Chippewa Tribe, organized in 1934. The Leech Lake Reservation has the second highest population of any reservation in Minnesota with White Earth Nation being the largest Minnesota Ojibwe tribe, Leech Lake Nation has a resident population of 11,388 indicated by the 2020 census.