John William Hammer (born 27 September 1935) is the founder of several sporting competitions for older players.
He founded Superules, an Australian rules football competition for those over 35 years of age at a meeting at the Zero Inn, Nhill, Victoria in 1980. A football carnival is held at a different location in Australia each year.
He also founded Over 60s cricket in Australia, promoting cricket for those over 60 years of age.
John Hammer was born in Sunbury, Victoria, Australia.