Allegheny Mountain may refer to:
- The Allegheny Mountains range in the eastern United States
- Mountains within the range, including:
- Allegheny Mountain (West Virginia-Virginia), or "Alleghany", demarcating much of the border between the two states
- Allegheny Mountain (Pennsylvania) in southwestern Pennsylvania
- The Allegheny Front, in Pennsylvania, Maryland, and West Virginia
- Mountains within the range, including:
- The Allegheny Escarpment, which forms the western edge of the Appalacians