Harrison Lake is an unincorporated community and census-designated place (CDP) in Bartholomew County, Indiana, United States.

[2] It is part of the Columbus, Indiana, metropolitan statistical area.

A third reservoir, Tamerix Lake, lies to the south, outside the CDP.

Columbus, the county seat, is 7 miles (11 km) to the east.

[1] Via Denios Creek, the Harrison Lakes drain southeast to the East Fork of the White River.