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- Richard Edward O'Connor, Foundation Justice of the High Court of Australia
- Hon Edward David Stewart Ogilvie MLC, Pastoralist.
- Arthur Alexander Walton Onslow, Naval officer and politician.
- Sir Alexander Campbell Onslow, Judge.
- Major-General Reverend Coles Alexander Osborne, CIE.
- Rt Hon Sir William Francis Langer Owen KBE, Judge of the Supreme Court of New South Wales and of the High Court of Australia.
- Sir William Owen, Royal commissioner and Chief Judge in Equity of the Supreme Court of New South Wales.
- Sir Langer Meade Loftus Owen CBE QC, Barrister and head of Red Cross
Read more about this topic: List Of Australian Club Members