Piney Fork is an unincorporated community in central Smithfield Township, Jefferson County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 43941. The stream of Piney Fork flows southeast past the community; it meets Short Creek in far western Warren Township, and Short Creek in turn meets the Ohio River at Rayland.
Piney Fork is part of the Weirton–Steubenville, WV-OH Metropolitan Statistical Area.
Public education in the community of Piney Fork is provided by the Buckeye Local School District.
Coordinates: 40°15′17″N 80°49′37″W / 40.25472°N 80.82694°W