The Redeye River is a tributary of the Leaf River, 73 miles (117 km) long, in central Minnesota in the United States. Via the Leaf and Crow Wing Rivers, it is part of the watershed of the Mississippi River, draining an area of 222 square miles (570 km2) in a rural region. The river's name comes from the Native Americans of the area, who saw many red-eye fish in the river.

Otter Tail County is a county in the U.S. state of Minnesota. As of the 2020 census, its population was 60,081. Its county seat is Fergus Falls. Otter Tail County comprises the Fergus Falls micropolitan statistical area. With 1,048 lakes in its borders, Otter Tail County has more lakes than any other county in the United States.