Posen Township is a civil township of Presque Isle County in the U.S. state of Michigan. The population was 808 at the 2020 census, down from 959, at the 2000 census, which 65.4% (652) of which reported Polish ancestry.

Presque Isle County is a county in the Lower Peninsula of the U.S. state of Michigan. As of the 2020 census, the population was 12,982. The county seat is Rogers City. The county was authorized by state legislative action on April 1, 1840, but the county government was not established until 1871. The government was reorganized in 1875.