John William McCormack (December 21, 1891 - November 22, 1980) was an American politician from Boston, Massachusetts. McCormack served as a member of United States House of Representatives from 1928 until he retired from political life in 1971. A Democrat, McCormack served as House Majority Leader thrice, the first time from 1940 to 1947, the second time from 1949 to 1953, and again from 1955 to 1962. He served as Speaker of the House of Representatives from 1961 until 1971.
