William McLean Hamilton, PC OC (February 23, 1919 – June 7, 1989) was a Canadian politician.
His father, Ernest Hamilton, was a lacrosse player who won a gold medal at the 1908 Summer Olympics.
In his maiden speech to Parliament in November he accused the Liberal government led by Louis St. Laurent of being socialists.
Despite his staunch fiscal conservatism and anti-communism, he was a supporter of the Quebec Liberal Party over the Union Nationale.
Hamilton disliked the corruption of the Union Nationale and their infusion of strict Catholicism into Quebec politics.