William Gerard Power (April 19, 1882 – July 8, 1940) was a Canadian politician.

Born in the parish of Sillery, Quebec, the son of William Power and Susan Winifred Rockett, Power was educated at the Commercial Academy of Quebec and the College Mont-Saint-Louis in Montreal .

Named to the Legislative Council of Quebec in 1923 for the division of Stadacona as a Liberal.

His brother, Charles Gavan Power, was an MP and senator; another brother, Joe Power, was a professional ice hockey player and member of the Legislative Assembly of Quebec; yet another brother, James Power, was a professional ice hockey player.

His great-nephew Lawrence Cannon was a Conservative MP and cabinet minister.