Hen Run is a long 1st order tributary to the Youghiogheny River in Fayette County, Pennsylvania.
Hen Run rises about 2 miles west of Confluence, Pennsylvania, and then flows east to join the Youghiogheny River at Confluence.
Hen Run drains of area, receives about 47.1 in/year of precipitation, has a wetness index of 328.98, and is about 72% forested.