Browse Corporate Bodies - O
- Oatley Flora and Fauna Conservation Society (1955 - )
- Office of Environment & Heritage, NSW National Parks & Wildlife Service, Dalrymple-Hay Nature Reserve (1972 - )
- Office of Special Projects, Swinburne University of Technology
- Oil Drilling & Exploration Limited (ODE)
- see Australian Oil & Gas Corporation Limited (1954 - ?) - Oil Mallee Company (1997 - )
- Olex Cables Limited (1973 - )
- The Olivia Newton-John Cancer and Wellness Centre (c. 2012 - )
- Olympic Tyre and Rubber Co (1934 - 1980)
- ONJCWC
- see The Olivia Newton-John Cancer and Wellness Centre (c. 2012 - ) - Onkaparinga Woollen Company Pty Ltd (1928 - 1970)
- Optical Munitions Panel (1940 - 1945)
- Optical Society of Australia
- see Australian Optical Society (1983 - ) - Optical Waveguides Australia Pty (1984 - 1999)
- Optics Section, Munitions Supply Laboratories (MSL)
- Optik
- Optometrists Association Australia (c. 1998 - )
- Optometry Australia (2013 - )
- Optus (1992 - )
- Optus Networks Pty Ltd
- Oral Health Cooperative Research Centre
- see Oral Health CRC (2009 - 2018) - Oral Health CRC (2009 - 2018)
- Orbital Engine Company (OEC) (1973 - )
- Ord River Catchment Regeneration Project (1960 - )
- Ordnance Factory (1924 - 1989), Commonwealth of Australia
- Ore Dressing Investigations - collaborative venture (1934 - 1970)
- Orica Limited (1998 - )
- Orygen
- see Orygen The National Centre of Excellence in Youth Mental Health (1984 - ) - Orygen The National Centre of Excellence in Youth Mental Health (1984 - )
- Otto Madsen Dairy Research Laboratories
- Overseas Telecommunications Commission (1946 - 1992)