Browse Corporate Bodies - O
- O.Gilpin Limited (1922 - )
- O.K. Creek Tin Mining Company
- Oakey Dairying Company Limited
- Oakey District Co-operative Butter Association Limited
- O'Brien Publicity Pty Ltd (1914? - )
- Occidental and Regal Insurance Co
- Ocean Salt (Extended) Limited
- Oldfields Bakery Pty Ltd (1947 - )
- Olympic Cables Limited (1940? - )
- Olympic Consolidated Industries Limited (1953 - 1980)
- Olympic Tyre and Rubber Company Pty Ltd (1933 - 1953)
- One Steel Limited (2000 - )
- Onkaparinga Woollen Company
- Orbost Butter and Produce Company Limited (1892 - 1966)
- Ord Minnitt Limited (1984 - )
- Orient Steam Navigation Company (1878 - )
- Origin Energy Limited (2000 - )
- Ottoman Bank, Salonica
- Overseas Corporation (Australia) Limited