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

It is 2 miles (3 km) north of Monterey, the mailing address for the community, 7 miles (11 km) southwest of Culver, and 14 miles (23 km) southeast of Knox, the Starke county seat.

[1] The lake outlet at its south end drains south to the Tippecanoe River, part of the Wabash River watershed.

The United States Census Bureau delineated Hartz Lake as a census designated place in the 2022 American Community Survey.

This Starke County, Indiana location article is a stub.