Organizations
- Alleghany Corp., a railroad 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
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