John Charles McCormack (25 June 1904 – 16 July 1996) was an Australian rugby league footballer who played in the 1920s and 1930s.

A state representative fullback, he played with three different Sydney clubs in the New South Wales premiership competition.

A product of Penshurst, New South Wales, Jack McCormack played with St George Dragons for five years between 1927 and 1932.

He was a part of the Canterbury side which won their first ever premiership in 1938 defeating Eastern Suburbs in the final.

This rugby league football biography relating to an Australian born in the 1900s is a stub.