McMillan Township is a civil township of Ontonagon County in the U.S. state of Michigan.

The population was 406 at the 2020 census.

[3] According to the United States Census Bureau, the township has a total area of 70.50 square miles (182.59 km2), of which 70.43 square miles (182.41 km2) is land and 0.07 square miles (0.18 km2) (0.10%) is water.