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      Council of Heads of Australasian Herbaria |  | 
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| OAKDEN, Emma, Miss | 1848-1889 | Collected for Mueller in TAS | 
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| OAKLEY, Agnes Elizabeth | 1864-1942 | Flower painter, often native plants, Melbourne, VIC | 
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| OAKMAN, Harry | 1906-2002 | Horticulturist, landscape designer, botanical photographer, NSW, ACT | ||
| OBENBERGER, | fl. 1915 | Botanical artist, Prague | 
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| O'BRIEN, Terence Phillip, Dr | 1937- | Botanist, Reader Botany Monash Uni, VIC | ||
| O'CONNOR, Anne | 1939- | Botanical artist, NSW | ||
| O'DONNELL, H.J. | fl.1886 | See entry for O'DONNELL, William J. | 
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| O'DONNELL, William J. | fl.1883-88 | Expedition leader, explorer, Kimberley region, NT, WA | 
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| OFFICER, Edith (sister) | 1872-1908 | Amateur collector, nursing student, NSW | 
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| OFFICER, Ernest (brother) | 1870-1936 | Pastoralist, collector, expeditioner, NSW | ||
| OFFLER, Christina E., Dr | 1945- | Palaeobotanist, SA, QLD | 
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| OGILVIE, P. | 
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| O'HALLORAN, Florence Julia | 1874-1921 | Collected for Mueller in SA. | 
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| O'HALLORAN, Thomas Joseph Shuldham | 1835-1922 | Stipendiary magistrate, SA | 
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| OKTOBER, Tricia | 1941- | Botanical artist, children's book illustrator, NSW | ||
| OLDFIELD, Augustus Frederick | 1820-1887 | Botanist, TAS, WA | 
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| OLDHAM, Thomas, Dr | fl. 1850-60 | Geologist | 
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| OLIVER, J. | 
 | Collector of lichens | 
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| OLIVER, Walter Reginald Brook | 1883-1957 | Botanist, collected Pacific islands and NZ | 
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| OLLERENSHAW, Peter | fl. 1970s | Horticuluralist, nurseryman, ACT | ||
| OLSEN, Albert Mervyn (Mick) | 1917-2008 | Fisheries offices, Alginates (Aust), TAS, SA | ||
| OLSEN, Ian Sinclair | 1943- | 
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| OLSEN, Michael Francis (Mike) | 1954- | Botanist, ecologist consultant, educator, QLD | 
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| O'NEILL, Margaret Molly | 1913-2000 | Naturalist, plant photographer, NSW | ||
| ORAM, Nicola | 1966- | Botanical illustrator | ||
| ORAM, Rex Neville, Dr | 1931- | Plant breeder | 
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| ORCHARD, Anthony Edward, Dr* | 1946- | Botanist, Herbarium Curator, editor, SA, Tas, ACT | ||
| ORCHARD, Theresa Ann, née HALLIDAY | 1942– | Collector, author, SA, NZ, ACT | ||
| O'REILLY, M. | fl. 1940s-60s | 
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| ORMAY, Peter I. | 1938-2016 | Carpenter, ranger, author, collector. Antarctic, ACT | ||
| ORME, Andrew Edward | 1978- | Photographer and collector for Royal Botanic Gardens Sydney, NSW | 
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| O'ROURKE, J. | 
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| ORR, D. | 
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| O'RYAN, Clara, Mrs | 
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| O'RYAN, Kathleen Marie | 1958- | Botanical illustrator, ACT | 
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| OSBBORN, G. | fl. 1915 | 
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| OSBORN, Edith May | 1887-1958 | English-born botanist, phycologist, UK, NSW, SA | ||
| OSBORN, Theodore George Bentley | 1887-1973 | English-born botanist, ecologist, Professor, Koonamore, UK, NSW, SA | ||
| OSBORNE, Elizabeth (Betsy) Jane | 1954- | Botanical illustrator, worked for Flora of Aust., ACT | ||
| O'SHANESY, John | 1834-1899 | Nurseryman, QLD | 
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| O'SHANESY, Patrick Adams | 1837-1884 | Nurseryman, QLD | 
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| OSSWALD, Ferdinand Carl | fl.1840s-1850s | German-born pharmacist, collector, Adelaide, SA | 
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| OSTENFELD, Carl Emil Hansen | 1873-1931 | Danish botanist, Gardens Director, coll. WA | ||
| OSTENFELD, Gertrud Hansen | 1904- | Phycologist, illustrator; daughter of C.E.H.Ostenfeld | 
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| OSTERKAMP-MADSEN, Monika | fl. 2000's | Botanical illustrator, Darwin, NT | 
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| OVENDEN, Peter John | 1929- | Forester, NSW | 
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| OVERALL, J. | fl. 1920s | 
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| OWER, Leslie H. | fl. 1920- | Geologist | 
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| OXENFORD, R.A. | fl. 1940s | 
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| OXLEY, John Joseph William Molesworth | 1783-1828 | English-born Australian explorer and Surveyor-General, NSW | 
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Surnames (Family names) starting with: 
  A     B     C 
      D     E     F 
      G     H     I 
      J     K     L 
      M     N     O 
      P-Q     R     S 
      T     U-V     W 
      X-Y-Z 
* = information contributed by the collector/illustrator themselves (to Willis et al) pre 1986
^^ = information from: George, A.S. (2009) Australian Botanist's Companion, Four Gables Press, WA.
 
Last Updated on 24 April, 2025 by CHAH webmaster (cpbr-info@anbg.gov.au)