Port Clinton is a city in and the county seat of Ottawa County, Ohio, United States, located at the mouth of the Portage River on Lake Erie. The population was 6,025 at the 2020 census. It is the principal city of the Port Clinton micropolitan area, about 34 miles (55 km) southeast of Toledo.

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".