Pottersburg (originally known as Pottersburgh) is an unincorporated community in Allen Township, Union County, Ohio, United States. It is located at 40°15′58″N 83°30′03″W / 40.26611°N 83.50083°WCoordinates: 40°15′58″N 83°30′03″W / 40.26611°N 83.50083°W, along U.S. Route 33 between Marysville and Bellefountaine, about 4 miles west of Marysville.
Pottersburg was laid out along the Atlantic and Great Western Railroad in 1868. That same year, a sawmill was built. The Pottersburg Post Office was originally established as the Pottersburgh Post Office on June 29, 1869. In 1872, the railway company built a railroad depot and a telegraph office. As of 1877, the community contained two stores, one warehouse, one telegraph office, and the district school-house. The post office name was changed to Pottersburg Post Office on June 1, 1894, and later discontinued on October 30, 1926. The mail service is delivered through the Marysville branch.