John O'Neill (9 May 1943 – 9 August 1999) was an Australian representative rugby league prop forward whose club career was spent with South Sydney and Manly-Warringah during the 1960s and early 1970s.
He made 2 Test appearances for the Australian national representative side; he represented in 7 World Cup matches in two World Cups and in one World Championship match and in 5 Kangaroo tour matches in 1973.