The northwestern wolf, Canis lupus occidentalis, also known as the Mackenzie Valley wolf, Alaskan timber wolf, Canadian timber wolf, or northern timber wolf, is a subspecies of gray wolf in western North America. It ranges from Alaska, the upper Mackenzie River Valley; southward into the Canadian provinces of British Columbia, Alberta, and Saskatchewan as well as the Northwestern United States. Along with C. l. nubilus, C. l. occidentalis is the most widespread member of the five gray wolf subspecies in North America, with at least six different synonyms.