Union Township is one of the seventeen townships of Hancock County, Ohio, United States.

Located in the western part of the county, it borders the following townships: Two villages are located in Union Township: Mount Cory in the south, and Rawson in the east.

It is one of twenty-seven Union Townships statewide.

[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.