Browse Entries - O
- Oakden, Emma (1848 - 1889), Botanical collector
- Oakes, Harold Clarence (1881? - 1960), Chemist and Assayer
- Oakes, Leslie Francis (1914 - 1974), Chemical engineer
- Oatley Flora and Fauna Conservation Society (1955 - )
- O'Brien, Brian John (1934 - 2020), Physicist
- O'Brien, Claude Harding (1879 - 1960), Sugar technologist
- O'Brien, Ernest John (1914 - 1996), Agricultural chemist
- O'Brien, Jack
- see O'Brien, Ernest John (1914 - 1996), Agricultural chemist - O'Brien, Keith George (1918 - 1995), Chemist
- O'Brien, Mary Jane
- see Abbott, Gertrude (1846 - 1934), Medical administrator and Nun - O'Brien, Mick
- see O'Brien, Keith George (1918 - 1995), Chemist - O'Brien, Robert Gordon (1897? - 1956), Food scientist and Analytical chemist
- O'Brien, Terence Phillip (1937 - ), Botanist
- O'Bryan, Moira (1966 - ), Medical scientist and Reproductive biologist
- O'Callaghan, Michael Angelo, Dairy expert
- Occleshaw, Alfred James (1888 - 1969), Chemist
- O'Connell, Daniel Joseph Kelly (1896 - 1982), Physicist
- O'Connor, Charles Yelverton (1843 - 1902), Engineer
- O'Connor, Colin (1928 - ), Civil engineer and Engineering historian
- O'Connor, Daniel John (1927 - 2014), Chemist
- O'Connor, Maxwell James (1936 - 1985), Inorganic chemist
- Oddie, Thomas Harold (1911 - 1990), Physicist and Radiologist
- O'Dea, Marjory
- see Langridge, Marjory, Author and Science biographer - Odernheimer, Frederic, Surveyor
- O'Donnell, James Hamilton (1934 - 1995), Physical chemist
- O'Donnell, Stella Rayner (1938 - ), Pharmacologist and Educator
- O'Donnell, Thomas Aloysius (Tom) (1923 - 2010), Inorganic chemist and University Administrator
- O'Dwyer, Daisy May
- see Bates, Daisy May (1863 - 1951), Anthropologist - O'Dwyer, Ida (1880 - 1960), Nurse
- O'Dwyer, J., Engineer
- Oertel, Alfred Charles (1910 - ), Physicist and Soil scientist
- O'Farrell, Antony Frederick Louis (1917 - ), Zoologist and Entomologist
- Office of Environment & Heritage, NSW National Parks & Wildlife Service, Dalrymple-Hay Nature Reserve (1972 - )
- Office of Special Projects, Swinburne University of Technology
- Officer, Doris Lyne (1898 - 1967), Physician
- Officer, Edith, Nurse and Plant collector
- Officer, Ernest (1870 - 1936), Pastoralist and Plant collector
- Ogg, Ernest Samuel ( - 1969), Chemist
- Ogg, J. Cumming, Forecaster
- Ogilby, James Douglas (1853 - 1925), Ichthyologist and Taxonomist
- Ogilvie, Bridget Margaret (1938 - ), Immunologist and Parasitologist
- Ogilvie, Florinda Katherine, Medical social worker
- Ogilvie, Graeme John (1924 - 2001), Metallurgical Engineer and Physicist
- O'Grady, Francis Philip ( - 1981), Electrical engineer
- Ogston, Alexander George (1911 - 1996), Biochemist
- O'Hehir, Robyn Elizabeth, Pathologist
- Oil Drilling & Exploration Limited (ODE)
- see Australian Oil & Gas Corporation Limited (1954 - ?) - Oil Mallee Company (1997 - )
- O'Kane, Mary Josephine (1954 - ), Computer scientist and Vice-Chancellor
- Oke, Charles, Entomologist
- O'Keefe, Christine Margaret, Mathematician
- Olden, Garnet Edric (1886 - 1948), Analytical chemist
- Oldfield, Augustus Frederick (1820 - 1887), Botanical collector and Botanist
- Oldroyd, David Roger (1936 - 2014), Science historian
- O'Leary, Stephen John
- Olex Cables Limited (1973 - )
- Oliphant, Marcus Laurence Elwin (1901 - 2000), Physicist
- Oliver, Calder Edkins (1855 - 1930), Engineer
- Oliver, Carol, astrobiologist, Science Communication and Science educator
- Oliver, Douglas L., Anthropologist
- Oliver, Ivan Thomas (1929 - ), Biochemist
- Oliver, Margaret
- see McArthur, Annie Margaret (Margaret) (1919 - 2002), Anthropologist and Nutritionist - Oliver, Robin Langford, Geologist
- Oliver, Walter Reginald Brook (1883 - 1957), Botanist, Museum director and Ornithologist
- The Olivia Newton-John Cancer and Wellness Centre (c. 2012 - )
- Olle, Archibald Durrant (1868 - 1942), Chemist
- Olley, June Norma (1924 - 2019), Biochemist, Food scientist and Marine scientist
- Olliff, Arthur Sidney (1865 - 1895), Entomologist
- Olsen, Albert Mervyn (1917 - 2008), Fisheries expert
- Olsen, Gerald Richard (Jerry) (1949 - 2021), Ornithologist and Teacher
- Olsen, Jerry
- see Olsen, Gerald Richard (Jerry) (1949 - 2021), Ornithologist and Teacher - Olsen, Mick
- see Olsen, Albert Mervyn (1917 - 2008), Fisheries expert - Olsen, Olav Trygve (1890 - 1966), Civil engineer
- Olsen, Penelope Diane (1949 - ), Ornithologist
- Olsen, Penny
- see Olsen, Penelope Diane (1949 - ), Ornithologist - Olympic Tyre and Rubber Co (1934 - 1980)
- O'Mahony, Gerard (Gerry), Meteorologist
- O'Mara, Jim, Astronomer and Theoretical physicist
- O'Mullane, G. V., Electrical engineer
- O'Neil, Pamela Frances (1945 - ), Politician and Biochemist
- O'Neill, Antoinette L. (1945 - 1999), Ecologist, Geographer and Biologist
- O'Neill, Toni
- see O'Neill, Antoinette L. (1945 - 1999), Ecologist, Geographer and Biologist - ONJCWC
- see The Olivia Newton-John Cancer and Wellness Centre (c. 2012 - ) - Onkaparinga Woollen Company Pty Ltd (1928 - 1970)
- Onslow, Arthur Alexander Walton (1833 - 1882), Explorer and Naval officer
- Opat, Geoffrey Ivan (1935 - 2002), Physicist
- Öpik, Armin Aleksander (1898 - 1983), Geologist
- Oppenheim, Gerald (1925 - 1995), Pharmaceutical manufacturer and Company director
- Oppenheim, Victoria Marie Jane (1959 - ), Science administrator
- 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 - )
- Orchard, Anthony (Tony) (1946 - ), Systematic botanist
- Ord River Catchment Regeneration Project (1960 - )
- Ord, I.G., Psychologist
- Ordnance Factory (1924 - 1989), Commonwealth of Australia
- Ore Dressing Investigations - collaborative venture (1934 - 1970)
- Oreb, Robert, Electrical engineer and Optical Scientist
- O'Reilly, Henry George (1824 - 1877), Astronomer and Mariner
- O'Reilly, Marion Louisa
- see Piddington, Marion Louisa (1869 - 1950), Eugenist - O'Reilly, Susannah Hennessy (1881 - 1960), Physician and Obstetrician
- O'Reilly, Suzanne Yvette (1946 - ), Educator and Earth scientist
- Organic Chemistry Medal
- see A. J. Birch Medal (1992 - ), RACI - Organic Chemistry Division - Orica Limited (1998 - )
- Orlebar, John, Manufacturer
- Orlowska, Maria Elzbieta (1951 - ), Educator and Computer scientist
- Ormond, D. J., Electrical engineer
- Orygen
- see Orygen The National Centre of Excellence in Youth Mental Health (1984 - ) - Orygen The National Centre of Excellence in Youth Mental Health (1984 - )
- Osborn, Cyril John, Metallurgist
- Osborn, Theodore George Bentley (1887 - 1973), Botanist and Ecologist
- Osborne, Audrey Josephine
- see Cahn, Audrey Josephine (1905 - 2008), Dietician and Nutritionist - Osborne, George Davenport (1899 - 1955), Academic and Geologist
- Osborne, John Walter (1828 - 1902), Inventor
- Osborne, Michael Robert (1934 - ), Mathematician
- Osborne, William Alexander (1873 - 1967), Physiologist and Medical educator
- Osburn, Lucy (1836 - 1891), Nurse manager
- O'Shanesy, Patrick Adams (1837 - 1884), Botanical collector and Nurseryman
- Oshlack, Alicia (1975 - ), bioinformatician
- Osmond, Charles Barry (Barry) (1939 - ), Plant biologist
- Ostenfeld, Christian William, Explorer and Natural history collector
- Ostrikov, Kostya (Ken), Physicist
- Ostry, Diethelm, Physicist and Wireless expert
- O'Sullivan, Donna M C (1956 - ), Medical administrator
- O'Sullivan, John, Electrical engineer and Radio astronomer
- O'Sullivan, Timothy John (John) (1896 - 1957), Radiologist
- Otto Madsen Dairy Research Laboratories
- Otway, Ken (? - 1993), Technical officer
- Ouvrier, Robert Arthur (1940 - ), Neurologist and Paediatrician
- Ovenstone, John Allen (1925 - 1984), Computer scientist
- Overbeck, H., Entomologist
- Overseas Telecommunications Commission (1946 - 1992)
- Owen, Evelyn Ernest (Evo) (1915 - 1949), Inventor
- Owen, Morris David (1917 - 2004), Radiologist and Science archivist
- Owen, Percy Thomas (1862 - 1927), Civil engineer and Military engineer
- Owen, Richard (1804 - 1892), Naturalist and Anatomist
- Owen, T. M., Industrial chemist
- Oxley, John Joseph William Molesworth (1784 - 1828), Surveyor and Explorer