The Waterloo Hawks were a minor league team that existed on-and-off from 1922 to 1969. From 1922 to 1932, they played in the Mississippi Valley League and in 1932 they were affiliated with the Chicago White Sox. They played in the Western League in 1936 and from 1940 to 1942 they played in the Illinois-Iowa-Indiana League and were affiliated again with the White Sox. From 1958 to 1969 they played in the Midwest League and were affiliated with the Boston Red Sox (1958–1968) and Kansas City Royals (1969). They were located in Waterloo, Iowa.