Marion Township is one of the thirteen townships of Henry County, Ohio, United States.

Located in the southern part of the county, it borders the following townships: The village of Hamler is located in northeastern Marion Township.

It is one of twelve Marion Townships statewide.

[4] 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.