Obstetrician
- Adam, George Rothwell Wilson (Rothwell) (1853 - 1924), Gynaecologist and Obstetrician
- Allan, Robert Marshall (1886 - 1946), Obstetrician and Gynaecologist
- Browne, Grace Cuthbert (1900 - 1988), Obstetrician and Gynaecologist
- Carey, Harvey McKay (1917 - 1989), Obstetrician and Gynaecologist
- Clement, Dixie Paumier (1879 - 1935), Physician and Obstetrician
- D'Arcy, Constance Elizabeth (1879 - 1950), Obstetrician and Gynaecologist
- Hamlin, Elinor Catherine (1924 - ), Obstetrician and Gynaecologist
- Heighway, Freida Ruth (Ruth) (1907 - 1963), Gynaecologist and Obstetrician
- Hollyock, Vernon Ernest (1916 - 2000), Obstetrician and Gynaecologist
- Leeton, John, Medical scientist, Gynaecologist and Obstetrician
- Llewellyn-Jones, John Derek (1923 - ), Obstetrician and Gynaecologist
- Maguire, Frederick Arthur (1888 - 1953), Gynaecologist and Obstetrician
- McBride, William Griffith (1927 - ), Obstetrician and Gynaecologist
- Meyer, Felix Henry (1858 - 1937), Obstetrician and Gynaecologist
- Munro, Andrew Watson (1858 - 1944), Obstetrician and Gynaecologist
- Munro, Heather May (1943 - ), Obstetrician and Gynaecologist
- O'Reilly, Susannah Hennessy (1881 - 1960), Physician and Obstetrician
- Schlink, Margaret (1916 - ), Obstetrician and Gynaecologist
- Shearman, Rodney Phillip, Obstetrician and Gynaecologist
- Simpson, George (1899 - 1960), Obstetrician and Gynaecologist
- Wilson, Arthur Mitchell (1888 - 1947), Obstetrician
- Windeyer, John Cadell (1875 - 1951), Obstetrician
- Wood, Edwin Carlyle (1929 - ), Medical scientist, Gynaecologist and Obstetrician
Occupational hygienist
- de Silva, Pamela Elizabeth (1930 - 1997), Occupational hygienist
Occupational therapist
- Barker, Joanna Mary (1942 - ), Occupational therapist and Educator
- Graham, Jennifer Margaret (Jenny) (1950 - ), Occupational therapist and Educator
- Jacob, Freda Elizabeth (1919 - ), Occupational therapist
- Strong, Jennifer (1959 - ), Occupational therapist and Educator
Oceanographer
- Gill, Adrian Edmund (1937 - 1986), Meteorologist and Oceanographer
- McDougall, Trevor John (1952 - ), Oceanographer
- McEwan, Angus David (1937 - ), Oceanographer
Oenologist
- Beckwith, Arthur Ray (Ray) (1912 - ), Oenologist
Oncologist
- Cory, Suzanne (1942 - ), Biochemist and Molecular oncologist
- Redpath, Margaret Ruth (1940 - ), Oncologist
- Sambrook, Joseph Frank (1939 - ), Oncologist
Oologist
- Haines, Lawrence Courtney (Courtney) (1920? - 1996), Ornithologist, Oologist and Taxidermist
- Jackson, Sidney William (1873 - 1946), Oologist and Ornithologist
Ophthalmologist
- Alder, Valerie (Val) (1942 - ), Ophthalmologist and Educator
- D'Ombrain, Ernest Arthur (c. 1867 - 1944), Ophthalmologist and Ornithologist
- Donaldson, Edgar John (Eddie) (1920 - 2000), Ophthalmologist
- Gibson, John Lockhart (1860 - 1944), Ophthalmologist
- Gregg, Norman McAlister (1892 - 1966), Ophthalmologist
- Hollows, Frederick Cossum (Fred) (1929 - 1993), Ophthalmologist
- Lewis, Nancy (1913 - 2002), Ophthalmologist
- Lowe, Ronald Francis Hinde (1913 - 1998), Ophthalmologist
- Monissey, Matthew John (c. 1909 - 1984), Physiologist and Ophthalmologist
- Rudall, James Thomas (1828? - 1907), Ophthalmologist and Pathologist
Optical technician
- Lord, Francis (1916 - ), Optical technician
- Matthaei, Ernst Artur Franz Joseph (1904 - 1966), Microscopist and Optical technician
Optician
- Baker, Henry Herbert (1867 - 1940), Optician and Business executive
- Basser, Adolph (1887 - 1964), Optician and Philanthropist
- Husbands, Henry (1870? - 1890?), Optician and Scientific instrument maker
- Knapp, August (1873 - 1943), Optician
Optics
- Elwin, Syd J. (1906 - 1990), Optics
- Frazier, Jim, Optics and Camera operator
- James, William Edwin (1931 - 1995), Physicist and Optics
- Jones, Damien, Optics
Optometrist
- Godfrey, Gordon Hay (1892 - 1979), Applied physicist and Optometrist
- Lederer, Josef (1921 - ), Physicist and Optometrist
Orchardist
- Ashby, Arthur Keith (1896 - 1971), Orchardist
- Campbell, Archibald George (1880 - 1954), Orchardist and Ornithologist
- Darwent, Joseph (c. 1847 - 1926), Orchardist and Politician
- Jasprizza, Nicholas (Nicole) (c. 1834 - 1901), Orchardist
- Nobelius, Carl Axel (1851 - 1921), Orchardist and Nurseryman
- Pye, James (1801 - 1884), Orchardist
Orchidologist
- Atkinson, Henry Brune (1874 - 1960), Orchidologist
- Braine, Arthur Belgrave (1854 - 1945), Teacher and Orchidologist
- Chadim, V.A., Orchidologist
- Hunt, Trevor E. ( - 1970?), Orchidologist
- Mair, Herbert Knowles Charles (1909 - 1999), Botanist and Orchidologist
- Nicholls, William Henry (1885 - 1951), Horticulturalist and Orchidologist
- Rogers, Richard Sanders (1861 - 1942), Physician and Orchidologist
Organic chemist
- Angyal, Stephen John (1914 - ), Organic chemist
- Arneman, William Gerhard (1904 - 1971), Organic chemist
- Badger, Geoffrey Malcolm (1916 - 2002), Organic chemist and Science administrator
- Bergamasco, Rinaldo (1949 - 1982), Organic chemist
- Birch, Arthur John (1915 - 1995), Organic chemist
- Black, David St Clair (1938 - ), Organic chemist
- Blumann, Arnold (1885 - 1970), Organic chemist
- Browne, Elaine Joy (1931 - 1993), Organic chemist
- Cameron, Donald William (1935 - ), Organic chemist
- Cheuychit, Pradit (1926 - 1988), Organic chemist
- Clark-Lewis, John William (1920 - ), Organic chemist
- Davis, Michael (1935 - 1998), Organic chemist
- Earl, John Campbell (1890 - 1978), Organic chemist
- Feutrill, Geoffrey Ian (1945 - 1987), Organic chemist
- Fung, Yik Man (1960 - 1998), Organic chemist
- Gascoigne, Robert Mortimer (1918 - 1994), Organic chemist and Science historian
- Gillis, Richard Galvin (c. 1914 - 1993), Organic chemist
- Hughes, Gordon Kingsley (1908 - 1955), Organic chemist
- Jackson, William Roy (1935 - ), Organic chemist
- Johns, Stanley R. (1935 - 1986), Organic chemist
- Kenner, James ( - 1974), Organic chemist
- Macbeth, Alexander Killen (1889 - 1957), Organic chemist
- Mackney, Alan W. (1913 - ), Organic chemist
- Mills, John Archer (1919 - 1977), Organic chemist
- Napier, Colin Elliot (1908 - 1992), Organic chemist
- Paddon-Row, Michael Nicholas (1942 - ), Organic chemist
- Pausaecker, K. H. (1923 - 1959), Organic chemist
- Rickards, Rodney Warren (1934 - ), Organic chemist
- Robinson, Robert (1886 - 1975), Organic chemist
- Sternhell, Sever (1930 - ), Organic chemist
Ornithologist
- Alexander, Wilfred Backhouse (1885 - 1965), Ornithologist
- Ashby, Edwin (1861 - 1941), Naturalist and Ornithologist
- Baker-Gabb, David, Ornithologist
- Balmford, Rosemary Anne (1933 - ), Judge and Ornithologist
- Barker, George Herbert (1880 - 1965), Business executive and Ornithologist
- Barnard, Charles Ashmale (1867 - 1942), Farmer and Ornithologist
- Barnard, George (1830 - 1894), Entomologist and Ornithologist
- Barrett, Charles Leslie (1879 - 1959), Naturalist and Ornithologist
- Belcher, Charles Frederic (1876 - 1970), Lawyer and Ornithologist
- Bell, Brian Douglas, Conservationist and Ornithologist
- Bell, Raoul Sunday (1882 - 1966), Ornithologist and Naturalist
- Berney, Frederick Lee (1865 - 1949), Naturalist and Ornithologist
- Binns, Gordon (1899 - 1976), Business executive and Ornithologist
- Boles, Walter, Ornithologist
- Bowyer-Bower, Thomas Henry (1862 - 1886), Ornithologist
- Broinowski, Gracius Joseph (1837 - 1913), Ornithologist and Artist
- Brouwer, Joost (1953 - ), Soil scientist and Ornithologist
- Brown, Arthur Graham (Graham) (1919 - 1982), Physician and Ornithologist
- Bryant, Charles Ernest William (1902 - 1960), Lawyer and Ornithologist
- Butler, Arthur Larchin (1862? - 1945), Ornithologist
- Calaby, John Henry (1922 - 1998), Naturalist and Ornithologist
- Cameron, Margaret Alison (1937 - ), Librarian and Ornithologist
- Campbell, Archibald George (1880 - 1954), Orchardist and Ornithologist
- Campbell, Archibald James (1853 - 1929), Ornithologist
- Carrick, Robert (? - 1988), Biologist and Ornithologist
- Carter, Thomas (1863 - 1931), Ornithologist
- Cayley, Neville Henry Pennington (1853 - 1903), Artist and Ornithologist
- Cayley, Neville William (1886 - 1950), Ornithologist
- Chaffer, Norman (1899 - 1992), Business executive, Photographer and Ornithologist
- Chalk, Aubrey Stubbing (1883 - 1957), Business executive and Ornithologist
- Chandler, Leslie Gordon (1888 - 1980), Ornithologist and Photographer
- Chenery, Arthur (1869 - 1948), Physician and Ornithologist
- Chisholm, Alexander Hugh (Alec) (1890 - 1977), Naturalist, Journalist and Ornithologist
- Christidis, Leslie (Les) (1959 - ), Ornithologist
- Clark, Matthew Symonds, Ornithologist and Aviculturalist
- Cleland, John Burton (1878 - 1971), Pathologist, Epidemiologist and Ornithologist
- Collins, Brian Gordon (c. 1937 - ), Zoologist, Physiologist and Ornithologist
- Condon, Herbert Thomas (1912 - 1978), Ornithologist and Taxonomist
- Cooper, Roy Percy (1907 - 1976), Ornithologist
- Cooper, William Thomas (1934 - ), Bird artist and Ornithologist
- Cornwall, Edward Mayler (1861 - 1937), Ornithologist
- Cotton, John (1802 - 1849), Naturalist, Pastoralist and Ornithologist
- Courtney, John Edgar (1934 - ), Farmer and Ornithologist
- Cullen, John Michael (Mike) (1927 - 2001), Ornithologist and Zoologist
- Davies, Stephen John James Frank (1935 - ), Naturalist and Ornithologist
- Day, Nicolas (1955 - ), Bird artist and Ornithologist
- De Vis, Charles Walter (1829 - 1915), Zoologist, Cleric and Ornithologist
- Dickison, Dudley John (1896 - 1967), Public servant and Ornithologist
- Disney, Henry John de S. (John), Ornithologist
- D'Ombrain, Ernest Arthur (c. 1867 - 1944), Ophthalmologist and Ornithologist
- Dove, Hamilton Stuart (c. 1864 - 1941), Naturalist and Ornithologist
- Dow, Douglas David, Ornithologist
- Emison, William Bert (1939 - 1999), Zoologist and Ornithologist
- Falla, Robert Alexander (1901 - 1979), Ornithologist
- Favaloro, Norman Joseph (1905 - 1989), Solicitor and Ornithologist
- Finsch, Otto (1839 - 1917), Ornithologist and Ethnologist
- Fitzherbert, Julie Catherine, Conservationist and Ornithologist
- Fleay, David Howells (1907 - 1993), Zoologist and Ornithologist
- Fleming, Charles Alexander (1916 - 1987), Palaeontologist and Ornithologist
- Fletcher, Jane Ada (1870 - 1956), Ornithologist and Poet
- Ford, Hugh Alastair (1946 - ), Ornithologist and Ecologist
- Ford, Julian Ralph (1932 - 1987), Chemist and Ornithologist
- Forshaw, Joseph, Biologist and Ornithologist
- Frith, Clifford Brodie (1949 - ), Ornithologist and wildlife photographer
- Frith, Dawn Whyatt (1943 - ), Ornithologist
- Frith, Harold James (1921 - 1982), Ornithologist
- Fullagar, Peter (1938 - ), Ornithologist
- Garnett, Stephen, Ornithologist
- Gilbert, Percy Albert (1883 - 1960), Natural history artist, Ornithologist and Botanist
- Gould, John (1804 - 1881), Ornithologist and Zoologist
- Gray, George Robert (1808 - 1872), Ornithologist
- Haines, Lawrence Courtney (Courtney) (1920? - 1996), Ornithologist, Oologist and Taxidermist
- Hall, Robert (1867 - 1949), Museum curator, Naturalist and Ornithologist
- Hanks, Ernest Silverton (1892 - 1973), Ornithologist
- Harrington, Graham Norman (1935 - ), Conservationist and Ornithologist
- Hindwood, Keith Alfred (1904 - 1971), Ornithologist and Company director
- Hitchcock, Warren Billingsley (1919 - 1984), Ornithologist
- Hobbs, John N. (1920 - 1990), Policeman; Ornithologist
- Hollands, David, Photographer, Ornithologist and Physician
- Hoskin, Ernest Sydney (1914 - ), Artist and Ornithologist
- Howe, Frank Ernest (1878 - 1955), Ornithologist
- Hull, Arthur Francis Basset (1862 - 1945), Public servant, Naturalist and Ornithologist
- Hutton, Frederick Wollaston (1836 - 1905), Zoologist, Geologist and Ornithologist
- Hyett, Jack (1915 - 2001), Teacher, Naturalist and Ornithologist
- Illidge, Rowland (1850* - 1929), Entomologist and Ornithologist
- Immelman, Klaus, Ornithologist
- Iredale, Tom (1880 - 1972), Conchologist and Ornithologist
- Jackson, Sidney William (1873 - 1946), Oologist and Ornithologist
- Jarman, Howard Ernest Alfred (1916 - 1982), Ornithologist
- Jenkins, Clee Francis Howard (1908 - 1997), Entomologist and Ornithologist
- Johnstone, Ronald Eric (1949 - ), Ornithologist
- Jones, Jack (1911 - 1989), Public servant and Ornithologist
- Joseph, Leo George (1958 - ), Ornithologist
- Keartland, George Arthur (1848 - 1926), Naturalist and Ornithologist
- Keast, James Allen (1922 - ), Ornithologist
- Kendall, Henry (c. 1849 - 1934), Ornithologist
- Kikkawa, Jiro (1929 - ), Ornithologist
- Kloot, Tess, Librarian and Ornithologist
- Knight, Frank (1941 - ), Natural history artist and Ornithologist
- Lane, Selwyn George (1922 - 2000), Administrator and Ornithologist
- Latham, John (1740 - 1837), Ornithologist
- Le Souef, Albert Sherbourne (1877 - 1951), Zoologist and Ornithologist
- Le Souef, Ernest Albert (1869 - 1937), Zoo director and Ornithologist
- Le Souef, William Henry Dudley (1856 - 1923), Zoo director and Ornithologist
- Leach, John Albert (1870 - 1929), Naturalist, Teacher and Ornithologist
- Legge, William Vincent (1841 - 1918), Ornithologist and Soldier
- Leishman, Alan, Printer and Ornithologist
- Leith, T. Augustus Forbes, Ornithologist and Ethnologist
- Lendon, Allan Harding (1903 - 1973), Surgeon and Ornithologist
- Littlejohns, Raymond Trewolla (1893 - 1961), Ornithologist and Photographer
- Littler, Frank Mervyn (1880 - 1922), Ornithologist and Entomologist
- Lord, Clive Errol (1889 - 1933), Naturalist, Museum curator and Ornithologist
- Lucas, Arthur Henry Shakespeare (1853 - 1936), Naturalist, Schoolmaster and Ornithologist
- Macdonald, James David (1908 - ), Ornithologist
- MacGillivray, Ian Hamilton (1899 - 1951), Physician and Ornithologist
- MacGillivray, William David Kerr (1867 - 1933), Naturalist, Physician and Ornithologist
- Mack, George (1899 - 1963), Museum director and Ornithologist
- Marchant, Stephen (1912 - ), Geologist and Ornithologist
- Marshall, Alan John (Jock) (1911 - 1967), Zoologist, Explorer and Ornithologist
- Mathews, Gregory Macalister (1876 - 1949), Ornithologist
- Mattingley, Arthur Herbert Evelyn (1870 - 1950), Ornithologist
- McCulloch, Ellen Margery (1930 - 2005), Ornithologist
- McEvey, Allan Reginald (1919 - 1996), Ornithologist
- McGill, Arnold Robert (1905 - 1988), Business executive and Ornithologist
- McGilp, John Neil (1881 - 1963), Pastoralist and Ornithologist
- McLennan, William Rae (1882 - 1935), Natural history collector and Ornithologist
- McMichael, Jessie, Teacher and Ornithologist
- Medland, Lilian Marguerite (1880 - 1955), Natural history artist and Ornithologist
- Mees, Gerlof F., Biologist and Ornithologist
- Mellor, John White (1868 - 1931), Ornithologist
- Middleton, William George Dyer (Bill) (1926 - ), Forester and Ornithologist
- Milligan, Alexander William (1858 - 1921), Natural history collector and Ornithologist
- Minton, Clive Dudley Thomas (1934 - ), Business executive and Ornithologist
- M'Lennan, Charles H. (1854? - 1915), Natural history collector and Ornithologist
- Moncrieff, Perrine Millais (1893 - 1979), Ornithologist
- Moors, Philip James (1948 - ), Conservationist and Ornithologist
- Morgan, Alexander Matheson (1867 - 1934), Physician and Ornithologist
- Morrison, Philip Crosbie (1900 - 1958), Naturalist, Science broadcaster and Ornithologist
- Murray, Mitchell Durno (Durno) (1925 - ), Veterinary scientist and Ornithologist
- Newman, Oliver Michael Griffiths (1941 - ), Metallurgist and Ornithologist
- Nicholls, Edward Dunham Brooke (Brooke) (1877 - 1937), Dentist, Writer and Ornithologist
- Nix, Henry Allan, Agricultural scientist and Ornithologist
- North, Alfred John (1855 - 1917), Ornithologist
- Oliver, Walter Reginald Brook (1883 - 1957), Botanist, Museum director and Ornithologist
- Olsen, Penelope Diane, Ornithologist
- Parker, Shane (1943 - 1992), Museum curator and Ornithologist
- Paton, David Cleland, Ornithologist
- Paton, Joan (1916? - 2000), Ornithologist
- Paton, Penny, Ornithologist
- Pizzey, Graham (1930 - 2001), Natural history writer, Ornithologist and Photographer
- Ragless, Gordon (1910? - ), Ornithologist
- Ramsay, Edward Pierson (1842 - 1916), Zoologist, Museum curator and Ornithologist
- Recher, Harry Frederick, Ornithologist and Conservationist
- Reilly, Pauline Neura (1918 - ), Ornithologist and Writer
- Roberts, Noel Lee (1890 - 1967), Journalist and Ornithologist
- Robinson, Angus Hargreaves (1907 - 1973), Farmer and Ornithologist
- Robinson, Frank Norman (1911 - 1997), Sound recorder and Ornithologist
- Ross, John Alexander (1868 - 1957), Solicitor and Ornithologist
- Rowley, Ian Cecil Robert (1926 - ), Ornithologist
- Ryan, Charles Snodgrass (1853 - 1926), Surgeon and Ornithologist
- Saunders, Denis Allan (1947 - ), Animal ecologist and Ornithologist
- Schodde, Richard (1936 - ), Ornithologist
- Sedgwick, Eric Harry (1909 - ), Naturalist and Ornithologist
- Serventy, Dominic Louis (1904 - 1988), Ornithologist
- Serventy, Vincent Noel (1916 - ), Naturalist, Author and Ornithologist
- Sharland, Michael (1899 - 1987), Naturalist, Journalist and Ornithologist
- Sharp, George, Ornithologist and Prospector
- Sharpe, Richard Bowdler (1847 - 1909), Ornithologist
- Simpson, Ken, Ornithologist and Teacher
- Slater, Peter, Artist and Ornithologist
- Smith, Laurence Alec (1944 - ), Ornithologist
- Snape, Brian, Chemist and Ornithologist
- Storr, Glen Milton (1921 - 1990), Ornithologist
- Sutton, John (1866 - 1938), Bank Manager and Ornithologist
- Thompson, Hubert Charles (c. 1869 - 1953), Naturalist and Ornithologist
- Tunney, John Thomas (1871 - 1929), Ornithologist
- van Tets, Gerard Frederick (1929 - 1995), Palaeontologist and Ornithologist
- Vickers-Rich, Patricia (1944 - ), Palaeontologist and Ornithologist
- Wall, Leonard Ernest (1921 - ), Ornithologist
- Warham, John, Natural history photographer and Ornithologist
- Watson, Ina Maud (1909 - 1992), Natural history photographer and Ornithologist
- Welsh, Lionel Vincent (1900 - ), Ornithologist
- Wettenhall, Henry Norman Burgess (1915 - 2000), Paediatrician and Ornithologist
- Wheeler, Wilson Roy (Roy) (1905 - 1988), Ornithologist
- White, Frederick William George (1905 - 1994), Physicist, Science administrator and Ornithologist
- White, Henry Luke (1860 - 1927), Pastoralist and Ornithologist
- White, Samuel (1835 - 1880), Ornithologist
- White, Samuel Albert (1870 - 1954), Ornithologist and Conservationist
- Whitlock, Frederick Bulstrode Lawson (1860 - 1953), Ornithologist
- Whittell, Hubert Massey (1883 - 1954), Ornithologist and Farmer
- Wieneke, Jo, School teacher and Ornithologist
- Wigan, Margaret Louise (1876 - 1970), Ornithologist and Matron
- Wilson, Stephen James (Steve) (1912 - ), Ornithologist and Public servant
- Woinarski, John Casimir Zichy, Ecologist and Ornithologist
- Woodall, Peter Frederick (1951 - ), Ornithologist
- Wyndham, Edmund (1943 - ), Ecologist, Teacher and Ornithologist
- Zann, Richard Alexis, Zoologist and Ornithologist
Orthodontist
- Begg, Percy Raymond (Raymond) (1898 - 1983), Orthodontist
- Chalmers, William Edwin (Bill) (1924 - 2001), Orthodontist
Orthopaedic surgeon
- Herz, Max Markus (1876 - 1948), Orthopaedic surgeon
- Huckstep, Ronald Lawrie (1926 - ), Orthopaedic surgeon
- MacKenzie, William Colin (1877 - 1938), Orthopaedic surgeon and Anatomist
- Nade, Sydney Michael Lewis, Orthopaedic surgeon
- Radcliffe-Taylor, Marion Aroha (1898 - ), Orthopaedic surgeon
Orthoptist
- Fitzmaurice, Kerry Clare (1951 - ), Orthoptist and Educator
Otolaryngologist
- Clark, Graeme Milbourne (1935 - ), Otolaryngologist
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