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

The population was 270 at the 2020 census.

[3] It was named for the Interior Lumber Company.

[4] According to the United States Census Bureau, the township has a total area of 89.37 square miles (231.47 km2), of which 86.42 square miles (223.83 km2) is land and 2.95 square miles (7.6 km2) (3.30%) is water.

A large portion of the township is within the Ottawa National Forest.