Rochester Township is one of the eighteen townships of Lorain County, Ohio, United States.

Located in southwestern Lorain County, it borders the following townships: The village of Rochester is located in northern Rochester Township.

It is the only Rochester Township 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, 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.