Stewartsville is an unincorporated community in Belmont County, in the U.S. state of Ohio.
A post office called Stewartsville was established in 1873, and remained in operation until 1998. The community was named for John Stewart, a businessperson in the local mining industry.
Sam Jones, a Major League baseball pitcher, was born in Stewartsville in 1925.
Coordinates: 40°00′43″N 80°51′29″W / 40.01194°N 80.85806°W