Belfast is an unincorporated community in Clermont County, in the U.S. state of Ohio.
The community was named after Belfast, Northern Ireland, the native land of a share of the first settlers. A post office called Belfast was established in 1840, and remained in operation until 1907.[1] Besides the post office, Belfast had a country store.[2] Its current mailing address for the area is for Goshen, Ohio 45122.