Date of Birth: 
About Denis O'Neil
- Denis O'Neil (born 11 February 1936) is a sailor from Australia.
- O'Neil represented his country at the 1972 Summer Olympics in Kiel.
- O'Neil took 16th place in the Soling with Robert Miller as helmsman and Ken Berkeley as fellow crew member.
- In 1975, O'Neil was part of the winning Soling team in the North American Championship and that same year, won the pre Olympic Regatta at Kingston.
- At the 1976 Montreal Olympics, he crewed in the Australian boat which finished eleventh in the soling class.
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