Morgan Run is a long 2nd order tributary to the Youghiogheny River in Fayette County, Pennsylvania.
According to the Geographic Names Information System, it has also been known historically as:
Morgan Run rises about 2.5 miles west of Holland Hill, Pennsylvania, and then flows north-northwest to join the Youghiogheny River at Indian Creek.
Morgan Run drains of area, receives about 48.4 in/year of precipitation, has a wetness index of 341.94, and is about 53% forested.
Morgan Run is the location of Middle Morgan Run BDA. The oak-dominated slopes along Morgan Run provide habitat for an animal species of special concern.