Berlin Township is one of the fourteen townships of Mahoning County, Ohio, United States. The 2010 census found 2,122 people in the township.
Located in the western part of the county, it borders the following townships:
No municipalities are located in Berlin Township.
Name and history 
Statewide, other Berlin Townships are located in Delaware, Erie, Holmes, and Knox counties.
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. Two are elected in the year after the presidential election and one is elected in the year before it. 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. Vacancies in the fiscal officership or on the board of trustees are filled by the remaining trustees.
The intersection of U.S. Route 224 and State Route 534, which lies about twenty miles southwest of Youngstown, Ohio, is located in central Berlin Township.
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