Workman Run is a long 1st order tributary to the Youghiogheny River in Fayette County, Pennsylvania.
Workman Run rises about 0.75 miles west of the community of Mill Run, and then flows west-southwest to join the Youghiogheny River about 2.5 miles west-southwest of Mill Run.
Workman Run drains of area, receives about 45.7 in/year of precipitation, has a wetness index of 342.42, and is about 71% forested.