O
- Professor Chris O'Brien, head and neck surgeon (2012)
- Stuart O'Grady, cyclist (2004) Olympic gold medal
- Johnny O'Keefe, Rock'n'Roll (1998)
- Susie O'Neill, swimmer (2000, 2012) Olympic gold medal
- Nathan Outteridge, sailing (2012) Olympic gold medal
- John Oxley, explorer (1976)
Read more about this topic: List Of People On Stamps Of Australia
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