北极狼（学名：Canis lupus arctos），又称白狼，是犬科的哺乳动物，也是灰狼的亚种，分布于欧亚大陆北部、加拿大北部和格陵兰北部。

北极狼一般比灰狼小，连尾巴长约3至5尺，成年的北极狼仅高3英尺；雄性比雌性的体型要大。牠们肩膀的高度由25到31英寸不等；北极狼一般重逾100磅，一只成熟的雄性甚至可重达175磅。曾经有一只被人类养的北极狼寿命长达18年；但是一般来说，在野外的北极狼的寿命只长7到10年。

The Arctic wolf (Canis lupus arctos), also known as the Melville Island wolf is a possible subspecies of gray wolf native to the Canadian Arctic Archipelago, from Melville Island to Ellesmere Island. It is a medium-sized subspecies, distinguished from the northwestern wolf by its smaller size, its whiter coloration, its narrower braincase, and larger carnassials. Since 1930, there has been a progressive reduction in size in Arctic wolf skulls, which is likely the result of wolf-dog hybridization.