Westmorland (formerly also spelt Westmoreland, an even older spelling is Westmerland) is an area of north west England and one of the 39 historic counties of England. It formed an administrative county from 1889 to 1974 and now forms part of Cumbria.

Westmorland was a constituency covering the county of Westmorland in the North of England, which returned Members of Parliament to the House of Commons of the Parliament of the United Kingdom.

Westmorland was a federal electoral district in New Brunswick, Canada, that was represented in the Canadian House of Commons from 1867 to 1968.