John O'Brien (8 October 1931 – 13 May 2020) was an Australian water polo player.
[1] He competed at the 1956 Summer Olympics and the 1960 Summer Olympics.
[2] In 2010, he was inducted into the Water Polo Australia Hall of Fame.
[3] He coached the Richmond Water Polo Club for almost 20 years.
This biographical article relating to an Australian water polo figure is a stub.