Put-in-Bay Township is one of the twelve townships of Ottawa County, Ohio, United States. The 2020 census found 813 people in the township.

Ottawa County is a county located in the northwestern part of the U.S. state of Ohio. As of the 2020 census, the population was 40,364. Its county seat is Port Clinton. The county is named either for the Ottawa (Odawa) Indigenous peoples who lived there, or for an Indigenous word meaning "trader".