Allegheny
- 2-6-6-6
- Allegany (disambiguation)
- Allegany County, Maryland
- Allegany County, New York
- Alleghany Corp.
- Alleghany County, North Carolina
- Alleghany County, Virginia
- Alleghany, California
- Allegheny (titular see)
- Allegheny (train)
- Allegheny Airlines
- Allegheny Cabin
- Allegheny College
- Allegheny County, Pennsylvania
- Allegheny Energy
- Allegheny Formation
- Allegheny Foundation
- Allegheny Front
- Allegheny Highlands Trail of Maryland
- Allegheny Mountain (Pennsylvania)
- Allegheny Mountain (West Virginia – Virginia)
- Allegheny Mountain Radio
- Allegheny Mountain Tunnel
- Allegheny Mountain dusky salamander
- Allegheny Mountains
- Allegheny National Forest
- Allegheny National Recreation Area
- Allegheny Observatory
- Allegheny Plateau
- Allegheny Railroad
- Allegheny Reservoir
- Allegheny River
- Allegheny River Tunnel
- Allegheny Technologies
- Allegheny Township, Blair County, Pennsylvania
- Allegheny Township, Butler County, Pennsylvania
- Allegheny Township, Cambria County, Pennsylvania
- Allegheny Township, Somerset County, Pennsylvania
- Allegheny Township, Venango County, Pennsylvania
- Allegheny Township, Westmoreland County, Pennsylvania
- Allegheny Trail
- Allegheny Valley Railroad
- Allegheny Valley Street Railway
- Allegheny Wildlife Management Area
- Allegheny chinquapin
- Allegheny mound ant
- Allegheny station (disambiguation)
- Allegheny woodrat
- Allegheny, Kentucky
- Allegheny, Pennsylvania
- Back Allegheny Mountain
- Great Allegheny Passage
- High Allegheny National Park and Preserve
- Little Allegheny Mountain
- Pachysandra procumbens
- Pittsburgh Allegheny (International Association)
- hellbender
- list of mountains of the Alleghenies
