Bellefontaine is a city in, and the county seat of, Logan County, Ohio, United States, located 48 miles (77 km) northwest of Columbus. The population was 14,115 at the 2020 Census. It is the principal city of the Bellefontaine micropolitan area, which includes all of Logan County. The highest point in Ohio, Campbell Hill, is within the city limits.

Logan County is a county in the west central portion of the U.S. state of Ohio. As of the 2020 census, the population was 46,150. The county seat is Bellefontaine. The county is named for Benjamin Logan, who fought Native Americans in the area.