Hall Run is a long 3rd order tributary to the Youghiogheny River in Fayette County, Pennsylvania.
According to the Geographic Names Information System, it has also been known historically as:
Hall Run rises at Fiketown, Pennsylvania, and then flows easterly to join the Youghiogheny River in Youghiogheny River Lake at Somerfield.
Hall Run drains of area, receives about 48.3 in/year of precipitation, has a wetness index of 350.05, and is about 72% forested.