Center Township is one of the fourteen townships of Mercer County, Ohio, United States.

The 2020 census found 1,099 people in the township.

Located in the northeastern part of the county, it borders the following townships: A small part of the city of Celina, the county seat of Mercer County, is located in southern Center Township.

[5] The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1.

There is also an elected township fiscal officer,[6] who serves a four-year term beginning on April 1 of the year after the election, which is held in November of the year before the presidential election.