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

Located in the southern part of the county, it borders the following townships: Two incorporated villages are located in Granville Township: part of Burkettsville in the south, and St. Henry in the north.

[4] The only other Granville Township in Ohio is in Licking County.

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,[5] 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.