William Mitchell Northey (April 29, 1872 – August 9, 1963), was an executive in the National Hockey League.

Born in Leeds, Quebec, Northey became secretary at the Montreal Hockey Club in 1893.

In 1909, he helped convince ice hockey executives to change two rules still in place today.

[citation needed] On November 25, 1922, Northey survived a serious traffic accident near Oakville, Ontario when three touring cars collided on the Hamilton highway, killing one man.

[1] Outside of ice hockey, Northey was also involved in horse racing as a secretary-treasurer with the Jockey Club of Montreal.