Allegheny, Alleghany or Allegany may refer to:

Places

Geologic and geographic features

* Allegheny River, in Pennsylvania and New York * Allegheny Mountains, part of the Appalachian Mountain Range in West Virginia, Pennsylvania, Maryland and Virginia **Allegheny Mountain (Pennsylvania), major mountain ridge in the northern part of the Allegheny Mountains **Little Allegheny Mountain, in Pennsylvania and Maryland; see list of mountains of the Alleghenies **Allegheny Mountain (West Virginia–Virginia), major mountain ridge in the southern part of the Allegheny Mountains **Back Allegheny Mountain, in West Virginia * Allegheny Plateau, which terminates in the east at the Allegheny Mountains * Allegheny Front, the escarpment delineating the eastern edge of the Allegheny Plateau * Allegheny Formation, a mapped bedrock unit of West Virginia, Maryland and Pennsylvania

Counties

*Allegany County, Maryland *Allegany County, New York *Alleghany County, North Carolina *Alleghany County, Virginia *Allegheny County, Pennsylvania

Communities and townships

* Alleghany, California, unincorporated community in Sierra County * Allegheny, Kentucky * Allegheny, Pennsylvania, a city annexed by the city of Pittsburgh in 1907 * 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

Protected areas

* Allegheny National Forest, Pennsylvania * Allegheny National Recreation Area, Pennsylvania * Allegheny Wildlife Management Area, in Mineral County, West Virginia * High Allegheny National Park and Preserve, a proposed NPS unit in West Virginia

Man-made features

* Allegheny Cabin (Rohrbaugh Cabin), historic structure in eastern West Virginia * Allegheny Observatory, at the University of Pittsburgh * Allegheny Mountain Tunnel, a vehicular tunnel on the Pennsylvania Turnpike * Allegheny Reservoir, a reservoir on the Allegheny River * Allegheny River Tunnel, a light rail tunnel under the Allegheny River in Pittsburgh * Trans-Allegheny Lunatic Asylum, a former psychiatric hospital turned tourist attraction in West Virginia

Trails

* Allegheny Trail, a hiking trail in West Virginia * Great Allegheny Passage including parts in Maryland and Pennsylvania * Allegheny Highlands Trail of Maryland, a rail trail

Rail

* Allegheny (train), ''Allegheny'' (train), a passenger train operated by the Pennsylvania Railroad * Allegheny Railroad, a railroad operating in northwestern Pennsylvania (1985–92) * Allegheny station (disambiguation), stations of the name * Allegheny Valley Railroad (disambiguation), railroads of that name * Allegheny Valley Street Railway, an electric rail line operating along the Allegheny River (1906–37) * Allegheny class, a class of 2-6-6-6 locomotives

Organizations

* Alleghany Corp., an insurance holding company * Allegheny Airlines, a forerunner of US Airways * Allegheny College, in Meadville, Pennsylvania * Allegheny Energy, a public utility (including its subsidiary Allegheny Power) * Allegheny Foundation, a charitable organization focused on Western Pennsylvania * Allegheny Mountain Radio, a network of radio stations in West Virginia and Virginia * Allegheny Technologies, a specialty metals company * Allegheny (titular see), a Roman Catholic titular see * Pittsburgh Allegheny (International Association), a nineteenth century minor league baseball team that, at times, played under the name "Allegheny"

Biology

* ''Pachysandra procumbens'' or Allegheny pachysandra, a plant in the box family * Allegheny woodrat, a species of pack rat in the eastern US * Allegheny Mountain dusky salamander, a species of the eastern US and Canada * Allegheny mound ant, a species of the eastern US and Canada * "Allegheny alligator", nickname for the hellbender * Allegheny chinquapin (''Castanea pumila''), a species of chestnut