The Alderney is an extinct breed of dairy cattle. It originated in, and is named for, the island of Alderney in the Channel Islands. It was one of three breeds of Channel Island cattle, the others being the Jersey and the Guernsey. In the eighteenth and nineteenth centuries "Alderney" was a general term for cattle from the archipelago; many were exported to mainland Britain under this name, regardless of which of the islands they came from.