o
- Habe – Tadashige Habe (1916–2001)
- Hiren – Hiren B Parmar (born 1985)
- Hablizl – Carl Ludwig Hablitz (1752–1821)
- Hachisuka – Masauji Hachisuka (1903–1953)
- Hadiaty – Renny Hadiaty
- Hadie – Wartono Hadie
- Haeckel – Ernst Haeckel (1834–1919)
- Hagen – Hermann August Hagen (1817–1893)
- Hahn – Carl Wilhelm Hahn (1786–1835)
- Haldeman – Samuel Stehman Haldeman (1812–1880)
- Haliday – Alexander Henry Haliday (1807–1870)
- Hallowell – Edward Hallowell (1808–1860)
- Hamilton, Hamilton-Buchanan – Francis Buchanan-Hamilton (1762–1829)
- Hammer – William R. Hammer
- Hampson – George Hampson (1860–1936)
- Handlirsch – Anton Handlirsch (1865–1935)
- Hanley – Sylvanus Charles Thorp Hanley (1819–1899)
- Hansemann – Johann Wilhelm Adolf Hansemann (1784–1862)
- Hansen – Hans Jacob Hansen (1855–1936)
- Harcourt – Edward William Vernon Harcourt (1825–1891)
- Hardwicke – Thomas Hardwicke (1755–1835)
- Harlan – Richard Harlan (1796–1843)
- Harper – Francis Harper (1886–1972)
- Harris, M.Harris – Moses Harris (1734–1785) entomology
- T.W.Harris – Thaddeus Williams Harris (1795–1856)
- Harrison – Colin James Oliver Harrison (1926–2003)
- Hartert – Ernst Hartert (1859–1933)
- Hartig – Theodor Hartig (1805–1880)
- Hartlaub – Gustav Hartlaub (1814–1900)
- Hassall – Arthur Hill Hassall (1817–1894)
- Hatcher – John Bell Hatcher (1861–1904)
- Hatschek – Berthold Hatschek (1854–1941)
- Haubold – Hartmut Haubold
- Haworth – Adrian Hardy Haworth (1767–1833)
- Hay – William Perry Hay (1872–1947)
- Hayman – R. W. Hayman
- Head – Jason J. Head
- Heads – Sam W. Heads
- Heaney – Lawrence Richard Heaney
- Heckel – Johann Jakob Heckel (1790–1857)
- Hector – James Hector (1834–1907)
- Heemstra – Phillip C. Heemstra
- Hellén – Wolter Edward Hellén (1890–1979)
- Heller – Joseph Heller (born 1941)
- Hellmayr – Carl Edward Hellmayr (1878–1944)
- Hemprich – Wilhelm Hemprich (1796–1825)
- Henle – Friedrich Gustav Jakob Henle (1809–1885)
- Henshaw – Henry Wetherbee Henshaw (1850–1930)
- Hentz – Nicholas Marcellus Hentz (1797–1856)
- Herbst – Johann Friedrich Wilhelm Herbst (1743–1807)
- Herdman – William Abbott Herdman (1858–1924)
- Hering – Erich Martin Hering (1893–1967)
- Herman – Ottó Herman (1835–1914)
- Hermann – Johann Hermann (1738–1800)
- Herre – Albert William Christian Theodore Herre (1869–1962)
- Herrich-Schäffer – Gottlieb August Wilhelm Herrich-Schäffer (1799–1874)
- Hershkovitz – Philip Hershkovitz (1909–1997)
- Hertlein – Leo George Hertlein (1898–1972)
- Heude – Pierre Marie Heude (1836–1902)
- Heuglin – Theodor von Heuglin (1824–1876)
- Heuvelmans – Bernard Heuvelmans (1916–2001)
- Hewitson – William Chapman Hewitson (1806–1878)
- Heydenreich – Gustav Heinrich Heydenreich (fl. mid-19th century)
- Heymons – Richard Heymons (1867–1943)
- Hildebrand – Samuel Frederick Hildebrand (1883–1949)
- Hilgendorf – Franz Martin Hilgendorf (1839–1904)
- Hilsenberg – Carl Theodor Hilsenberg (1802–1824)
- Hinton – Martin Hinton (1883–1961)
- Hirohito – Shōwa Emperor Hirohito (1901–1989)
- Hirst – Arthur Stanley Hirst (1883–1930) arachnology, British
- Hirst – David B. Hirst arachnology, Australian
- Hiyama – Yoshio Hiyama (1909–1988)
- Hodgson – Brian Houghton Hodgson (1800–1894)
- Hoese – Douglass F. Hoese
- Hoffmannsegg – Johann Centurius Hoffmannsegg (1766–1849)
- Hoffstetter – Robert Hoffstetter (fl. 19th century)
- Holbrook – John Edwards Holbrook (1794–1871)
- Holland – William Jacob Holland (1848–1932)
- Holmberg – Eduardo Ladislao Holmberg (1852–1937)
- Holmgren – August Emil Holmgren (1829–1888)
- Holthuis – Lipke Bijdeley Holthuis (1921–2008)
- Hombron – Jacques Bernard Hombron (1798–1852)
- Horn – George Henry Horn (1840–1897)
- W. Horn – Walther Hermann Richard Horn (1871–1939)
- Horner – Jack Horner (born 1946)
- Horsfield – Thomas Horsfield (1773–1859)
- Horváth – Géza Horváth (1847–1937)
- Hose – Charles Hose (1863–1929)
- Houttuyn – Martinus Houttuyn (1720–1798)
- Howard – Hildegarde Howard (1901–1998)
- Howell, A.H.Howell – Arthur H. Howell (1872–1940)
- Howes – William George Howes (1879–1946)
- Hoyle – William Evans Hoyle (1855–1926)
- Hu – Yaoming Hu
- Hübner – Jacob Hübner (1761–1826)
- Hubbs – Carl Leavitt Hubbs (1894–1979)
- Huene, von Huene – Friedrich von Huene (1875–1969)
- Huey – Laurence Markham Huey (1892–1963)
- Hulke – John Whitaker Hulke (1830–1895)
- Hume – Allan Octavian Hume (1829–1912)
- Humphrey – Philip Strong Humphrey (1926–2009)
- Hunt – Adrian P. Hunt
- Hutt – Steve Hutt
- J.S.Huxley – Julian Sorell Huxley (1887–1975) general zoology
- T.H.Huxley – Thomas Henry Huxley (1825–1895) general zoology
- Hwang – Sunny H. Hwang
I
- Ida – Hitoshi Ida (born 1940)
- Iredale – Tom Iredale (1880–1972)
- Illiger – Johann Karl Wilhelm Illiger (1775–1813)
- Ivantsoff – Walter Ivantsoff
- Ivie – Michael Aaron Ivie
- Ivie – Wilton Ivie
- Iwai – Tamotsu Iwai
J
- Jacobs – Jean-Charles Jacobs (1821–1907) entomology (Diptera, Hymenoptera)
- Jacquin – Nicolaus Joseph von Jacquin (1727–1817) mainly tropical American taxa
- Jacquinot – Honoré Jacquinot (1815–1887) mainly marine biology
- Jain – Sohan Lal Jain vertebrate paleontology
- Jakowlew – Alexander Ivanovich Yakovlev (1863–1909)
- James – Helen F. James (paleo)ornithology
- Jameson – Robert Jameson (1774–1854) general zoology
- Janensch – Werner Janensch (1878–1969) vertebrate paleontology (East African sauropods)
- Janson – Oliver Erichson Janson (1850–1926) entomology (Coleoptera)
- Jardine – William Jardine (1800–1874) general zoology
- Jebb – Matthew H. P. Jebb
- Jeffreys – John Gwyn Jeffreys (1809–1885)
- Jenkins – James Travis Jenkins (1876–1959)
- A. P. Jenkins – Aaron Peter Jenkins
- Jensen – James A. Jensen (1918–1998) vertebrate paleontology
- Jerdon – Thomas C. Jerdon (1811–1872) general zoology (South Asia)
- Q. Ji – Qiang Ji
- S. Ji – Shu-an Ji
- Jiménez de la Espada – Marcos Jiménez de la Espada (1831–1898) vertebrate zoology
- Jocqué – Rudy Jocqué
- G. D. Johnson – G. David Johnson
- Johnston – George Johnston
- Jordan – David Starr Jordan (1851–1931) ichthyology
- K. Jordan – Karl Jordan (1861–1959) entomology (Coleoptera, Lepidoptera, Siphonaptera)
- Jouanin – Christian Jouanin
K
- Kaila – Lauri Kaila
- Karsch – Ferdinand Karsch
- Katayama – Masao Katayama (born 1912)
- Kaup – Johann Jakob Kaup (1803–1873)
- Kay – E. Alison Kay (1928–2008)
- Keferstein – Wilhelm Moritz Keferstein (1833–1870)
- Kelaart – Edward Frederick Kelaart (1819–1860)
- Kellner – Alexander Wilhelm Armin Kellner
- Kellogg – Remington Kellogg (1892–1969)
- L. Kellogg – Vernon Lyman Kellogg (1867–1937)
- Kennedy – Clarence Hamilton Kennedy (1879–1952)
- Kennicott – Robert Kennicott (1835–1866)
- Kerr – Robert Kerr (1755–1813)
- Kessler – Karl Fedorovich Kessler (1815–1881)
- Keulemans – John Gerrard Keulemans (1842–1912)
- Keyserling – Eugen von Keyserling (1833–1889)
- Kieffer – Jean-Jacques Kieffer (1857–1925)
- Kielan-Jaworowska – Zofia Kielan-Jaworowska (1925–2015)
- King – Phillip Parker King (1793–1856)
- Kinnear – Norman Boyd Kinnear (1882–1957)
- Kirby – William Kirby (1759–1850)
- W. F. Kirby – William Forsell Kirby (1844–1912)
- Kirkaldy – George Willis Kirkaldy
- Kirkland – James Ian Kirkland (born 1954)
- Kishida – Kyukichi Kishida (1888–1968)
- Kittlitz – Heinrich von Kittlitz (1799–1874)
- O. Kleinschmidt – Otto Kleinschmidt (1870–1954)
- Kloss – Cecil Boden Kloss (1877–1949)
- Klotzsch – Johann Friedrich Klotzsch (1805–1860)
- Klug – Johann Christoph Friedrich Klug (1775–1856)
- Kner – Rudolf Kner (1810–1868)
- Knoch – August Wilhelm Knoch (1742–1818)
- Kobayashi – Yoshitsugu Kobayashi
- C. L. Koch – Carl Ludwig Koch (1778–1857)
- L. Koch – Ludwig Carl Christian Koch (1825–1908)
- Koelz – Walter Norman Koelz (1895–1989)
- Kolbe – Hermann Julius Kolbe (1855–1939)
- Kollar – Vincenz Kollar (1797–1860)
- Konings – Ad Konings
- Kono – Hiromichi Kono (1905–1963)
- Konow – Friedrich Wilhelm Konow (1842–1908)
- Kotlyar – Aleksandr Nikolaevich Kotlyar
- Kotthaus – Adolf Kotthaus
- Kraglievich – Lucas Kraglievich
- Kraatz – Ernst Gustav Kraatz (1831–1909)
- Krauss – Christian Ferdinand Friedrich Krauss (1812–1890)
- Krauss – Hermann August Krauss (1848–1939)
- Krabbe – Niels Krabbe (born 1951)
- Krefft – Johann Ludwig Gerard Krefft (1830–1881)
- Kriechbaumer – Joseph Kriechbaumer (1819–1902)
- Krohn – August David Krohn (1803–1891)
- Kropotkin – Peter Kropotkin (1842–1921)
- Ksepka – Daniel T. Ksepka
- Kuhl – Heinrich Kuhl (1797–1821)
- Kuiter – Rudolf Herman Kuiter (born 1943)
- Kulczynski – Władysław Kulczyński (1854−1919)
- Kuroda – Nagamichi Kuroda (1889–1978)
- Kurzanov – Sergei Mikhailovich Kurzanov
L
- Labillardière – Jacques Labillardière (1755–1834)
- Lacépède – Bernard Germain de Lacépède (1756–1825)
- Lacordaire – Jean Théodore Lacordaire (1801–1870)
- Lafresnaye – Frédéric de Lafresnaye (1783–1861)
- Laicharting – Johann Nepomuk von Laicharting (1754–1797)
- Lamarck – Jean-Baptiste Lamarck (1744–1829)
- Lamanna – Matthew Carl Lamanna
- Lambe – Lawrence Morris Lambe (1863–1919)
- Lambrecht – Kálmán Lambrecht
- Lameere – Auguste Lameere (1864–1942)
- Landbeck – Christian Ludwig Landbeck (1807–1890)
- Langer – Max Cardoso Langer
- Langston – Wann Langston, Jr. (1921–2013)
- Laporte – Francis de Laporte de Castelnau (1810–1880)
- Lapparent, de Lapparent – Albert-Félix de Lapparent (1905–1975)
- Larson – Helen K. Larson
- Latham – John Latham (1740–1837)
- Latreille – Pierre André Latreille (1762–1833)
- Laurent – Michèle de Saint Laurent (1926–2003) French carcinologist
- Laurenti – Josephus Nicolaus Laurenti (1735–1805)
- Laurillard – Charles Léopold Laurillard (1783–1853)
- Lavocat – René Lavocat
- Lawrence – George Newbold Lawrence (1806–1895)
- R.F. Lawrence – Reginald Frederick Lawrence (1897–1987)
- Laxmann – Erik Laxmann (1737–1796)
- Layard – Edgar Leopold Layard (1824–1900)
- Lea – Arthur Mills Lea (1868–1932)
- LeConte – John Lawrence LeConte (1825–1883)
- Leach – William Elford Leach (1791–1836)
- Leach – Edwin S. Leach (1878–1971)
- Lee – Yuong-Nam Lee
- Leech – John Henry Leech (1862–1900)
- Lehtinen – Pekka T. Lehtinen
- Leidy – Joseph Leidy (1823–1891)
- Leisler – Johann Philipp Achilles Leisler (1771–1813)
- Le Leouff – Jean Le Leouff
- Lembeye – Juan Lembeye (1816–1889)
- Lendzion – Kazimiera Lendzion
- Lepeletier – Amédée Louis Michel Lepeletier (1770–1845)
- Lesson – René-Primevère Lesson (1794–1849)
- Le Souef – Dudley Le Souef (1856–1923)
- Lesueur – Charles Alexandre Lesueur (1778–1846)
- Leuckart – Rudolf Leuckart (1822–1898)
- Leussler – R. A. Leussler
- Li – Li Sizhong (1921–2009)
- C.K.Li (also C.-K.Li or C.Li) – Chuankui Li
- D.Q.Li (also D.-Q.Li or D.Li) – Daqing Li
- P.P.Li (also P.-P.Li or P.Li) – Pipeng Li
- Lichtenstein – Martin Lichtenstein (1780–1867)
- Lilljeborg – Wilhelm Lilljeborg (1816–1908)
- Link – Johann Heinrich Friedrich Link (1767–1850)
- Linnaeus – Carl Linnaeus (1707–1778)
- Lindl. – John Lindley (1799–1865)
- Linsley – Earle Gorton Linsley (1910–2000)
- Lintner – Joseph Albert Lintner (1822–1898)
- Ljungh – Sven Ingemar Ljungh (1757–1828)
- Loche – Victor Loche (1806–1863)
- Lönnberg – Einar Lönnberg (1864–1942)
- Lowe – Richard Thomas Lowe (1802–1874)
- Lowe – Percy Lowe (1870–1948)
- Y.Y.Lu (also Y.-Y.Lu or Y.Lu) – Yuyan Lu
- Lü (also J.C.Lü, J.-C.Lü or J.Lü) – Junchang Lü
- S.Q.Lü (also S.-Q.Lü or S.Lü) – Shunqin Lü
- Lubbock – John Lubbock, 1st Baron Avebury (1834–1913)
- Luc – Michel Luc (1927–2010) nematology
- Lucas – Hippolyte Lucas (1814–1899)
- F.A. Lucas – Frederic Augustus Lucas (1852–1929)
- S.G. Lucas – Spencer G. Lucas
- Lull – Richard Swann Lull (1867–1957)
- Lund – Peter Wilhelm Lund (1801–1880)
- Lütken – Christian Frederik Lütken (1827–1901)
- Lydekker – Richard Lydekker (1849–1915)
- Lyon – Marcus Ward Lyon, Jr. (1875–1942)
M
- Mabile – Jules François Mabille (1831–1904)
- Macleay – William John Macleay (1820–1891)
- Mackovicky – Peter J. Mackovicky
- Makela – Robert R. Makela (1940–1987)
- Malaise – René Malaise (1892–1978)
- Maleev – Evgenii Aleksandrovich Maleev (1915–1966)
- Mannerheim – Carl Gustaf Mannerheim (1797–1854)
- Mantell – Gideon Mantell (1790–1852)
- Marcus – Ernst Marcus (1893–1968)
- Marinescu – Florian Marinescu
- Markevich – Aleksandr Prokofyevich Markevich (1905–1999)
- Marples – Brian J. Marples
- Marsh – Othniel Charles Marsh (1831–1899)
- Marshall – Guy Anstruther Knox Marshall (1871–1959)
- Marhsall – Thomas Ansell Marshall (1827–1903)
- Martill – David Michael Martill
- Martin – William Charles Linnaeus Martin (1798–1864) mainly mammals
- C.Martin – Claro Martin
- L.Martin – Larry Martin (born 1943) paleontology
- Martinez – Ruben D. Martinez
- R. Martínez Escarbassiere – Rafael Martínez Escarbassiere (born 1929)
- Marvin – Nigel Marven (born 1960)
- Maryanska – Teresa Maryańska
- Mason – Francis Mason (1799–1874)
- Massy – Anne Letitia Massy (1867–1931)
- Mateus – Octávio Mateus (born 1975)
- Mathews – Gregory Mathews (1876–1949)
- Matley – Charles Alfred Matley (born 1866)
- Matschie – Paul Matschie (1861–1926)
- Matsubara – Kiyomatsu Matsubara (1907–1968)
- Matsumura – Shōnen Matsumura (1872–1960)
- Matsuura – Keiichi Matsuura
- Mayr – Ernst Mayr (1904–2005) vertebrates, mainly birds
- G. Mayr – Gerald Mayr prehistoric vertebrates, mainly birds
- McCulloch – Allan Riverstone McCulloch (1885–1925)
- McLachlan – Robert McLachlan (1837–1904)
- Meade-Waldo – Edmund Meade-Waldo (1855–1934)
- Mearns – Edgar Alexander Mearns (1856–1916)
- Meek – Seth Eugene Meek (1859–1914)
- Meguro – Katsusuke Meguro
- Méhely – Lajos Méhelÿ (1862–1953)
- Meigen – Johann Wilhelm Meigen (1764–1845)
- Mello-Leitão – Cândido Firmino de Mello-Leitão (1886–1948)
- Melsheimer – Frederick Ernst Melsheimer (1782–1873)
- Menezes – Naercio Aquino de Menezes (born 1937)
- Ménétries – Édouard Ménétries (1802–1861)
- Merrem – Blasius Merrem (1761–1824)
- Merrett – Nigel Merrett
- Merriam – Clinton Hart Merriam (1855–1942)
- Mertens – Robert Mertens (1894–1975)
- Metcalfe – John William Metcalfe (1872–1952)
- Metschnikoff, Mechnikov – Ilya Ilyich Mechnikov (1845–1916)
- Meyen – Franz Meyen (1804–1840)
- Meyer, von Meyer – Christian Erich Hermann von Meyer (1801–1869) paleontology
- A.B.Meyer – Adolf Bernhard Meyer (1840–1911) birds, primates, entomology (mainly Wallacea)
- F.A.Meyer, F.A.A.Meyer, Meyer – Friedrich Albrecht Anton Meyer (1768–1795) birds, primates
- Meyer de Schauensee – Rodolphe Meyer de Schauensee (1901–1984) birds
- Meyrick – Edward Meyrick (1854–1938)
- Michener – Charles Duncan Michener (1918–2015)
- Middendorf, Midd. – Alexander von Middendorff (1815–1894)
- Midgley – Steven Hamar Midgley
- Miles – Clifford Miles
- Miller – Gerrit Smith Miller (1869–1956) mammals
- A.H.Miller – Alden H. Miller
- J.F.Miller – John Frederick Miller (1759–1796) mainly vertebrates
- L.H.Miller – Loye H. Miller paleontology, mainly birds
- R.R.Miller – Robert Rush Miller (1916–2003) fish
- Millet – Pierre-Aimé Millet (1783–1873)
- Milne-Edwards – Henri Milne-Edwards (1800–1885) mammals and crustaceans
- A.Milne-Edwards – Alphonse Milne-Edwards (1835–1900) birds
- Milner – Angela C. Milner
- Miranda-Ribeiro – Alípio de Miranda-Ribeiro (1874–1939)
- P.Miranda-Ribeiro – Paulo de Miranda Ribeiro (1901–1965)
- Mitchell – Thomas Mitchell (1792–1855)
- Mitchill – Samuel Latham Mitchill (1764–1831)
- Mitra – Tridib Ranjan Mitra
- Mizuno – Nobuhiko Mizuno
- Mochizuki – Kenji Mochizuki
- Mocsáry – Alexander Mocsáry (1841–1915)
- Mohr – Erna Mohr (1894–1968)
- Molina – Juan Ignacio Molina (1740–1829)
- Molnar – Ralph E. Molnar
- Mondolfi – Edgardo Mondolfi (1918–1999)
- Mones – Álvaro Mones (born 1942)
- Montagu – George Montagu (1753–1815)
- Moore – Frederic Moore (1830–1907) butterflies and moths
- J.C.Moore – Joseph Curtis Moore (1914–1995) rodents
- Mori – Tamezo Mori (1884–1962)
- Moreno – Francisco Moreno (1852–1919)
- Morley – Claude Morley (1874–1951)
- Morrow – James Edwin Morrow, Jr. (born 1918)
- Mortensen – Ole Theodor Jensen Mortensen (1868–1952)
- Möschler – Heinrich Benno Möschler (1831–1888)
- Motomura – Hiro Motomura fish, scorpionfish
- Motschulsky – Victor Ivanovitsch Motschulsky (1810–1871)
- Mourer-Chauviré – Cécile Mourer-Chauviré
- Moyer – Jack T. Moyer (1929–2004)
- Muche – Werner Heinz Muche (1911–1987)
- J.P.Müller, Müller – Johannes Peter Müller (1801–1858) mainly fish
- O.F.Müller – Otto Friedrich Müller (1730–1784) insects, fauna of Scandinavia
- Statius Müller, or P.L.S. Müller according to the IUCN [2] – Philipp Ludwig Statius Müller (1725–1776) birds, insects, some mammals and others
- Müller – Salomon Müller (1804–1864) mainly fauna of Indonesia
- Mulsant – Étienne Mulsant (1797–1880)
- Munday – Philip L. Munday
- Murphy – Robert Cushman Murphy (1887–1973)
- Murray – J. A. Murray
- Muttkowski – Richard Anthony Muttkowski (1887–1943)
N
- Nabokov – Vladimir Nabokov (1899–1977)
- Naef – Adolf Naef (1883–1949)
- Nagao – Takumi Nagao
- Naish – Darren Naish
- J. F. Naumann – Johann Friedrich Naumann (1780–1857)
- Natterer – Johann Natterer (1787–1843)
- Navás – R. P. Longinos Navás (1858–1938)
- Nehring – Alfred Nehring (1845–1904)
- Nelson – Edward William Nelson (1855–1934)
- Nelson – Joseph S. Nelson (1937–2011)
- Nesov, Nessov – Lev Alexandrovich Nesov (1947–1995)
- Netting – M. Graham Netting (1904–1996) herpetology
- Neumoegen – Berthold Neumoegen (1845–1895)
- Newman – Edward Newman (1801–1876)
- A. Newton – Alfred Newton (1829–1907)
- E. Newton – Edward Newton (1832–1897)
- Nichols – Albert Russell Nichols (1859–1933)
- Nichols – John Treadwell Nichols (1883–1958)
- Nielsen – Cesare Nielsen (1898–1984)
- Nikolskii – Aleksandr Mikhailovich Nikolskii (1858–1942)
- Nilsson – Sven Nilsson (1787–1883)
- Nitsche – Hinrich Nitsche (1845–1902)
- Noble – Gladwyn Kingsley Noble (1894–1940)
- Nopcsa – Franz Nopcsa von Felső-Szilvás (1877–1933)
- Norell – Mark A. Norell (born 1957)
- Norman – John Richardson Norman (1899–1944)
- D. Norman – David B. Norman (born 1952)
- North – Alfred John North (1855–1917)
- Novas – Fernando Emilio Novas
- Nowinski – Aleksander Nowiński
- Nuttall – Thomas Nuttall (1786–1859)
- Nylander – William Nylander (1822–1899)
O
- Oberholser – Harry Church Oberholser (1870–1963)
- Oberthür – Charles Oberthür (1845–1924)
- Obraztsov – Nicholas Sergeyevich Obraztsov (born 1906)[verification needed]
- Ochiai – Akira Ochiai (born 1923)
- Ogilby – William Ogilby (1808–1873) general zoology
- J.D. Ogilby – James Douglas Ogilby (1853–1925) ichthyology
- Ogilvie-Grant – William Robert Ogilvie-Grant (1863–1924)
- Ognev – Sergej Ognew (1886–1951)
- Oguma – Mamoru Oguma (1885–1971)
- Okamoto – Makoto Okamoto
- Oken – Lorenz Oken (1779–1851)
- Okumura – Teiichi Okumura
- Olfers – Ignaz von Olfers (1793–1872)
- Oliver – Walter Oliver (1883–1957)
- Olivi – Giuseppe Olivi (1769–1795)
- Olivier – Guillaume-Antoine Olivier (1756–1814)
- Olson – Storrs Olson (born 1944)
- Oppel – Nicolaus Michael Oppel (1782–1820)
- Ord – George Ord (1781–1866)
- Osbeck – Pehr Osbeck (1723–1805)
- Osborn – Herbert Osborn (1856–1954) entomology
- Osborn – Henry Fairfield Osborn (1857–1935) paleontology
- Osgood – Wilfred Hudson Osgood (1875–1947)
- Osi – Attila Ősi
- Osmólska – Halszka Osmólska (1930–2008)
- Osthelder – Ludwig Osthelder (1877–1954)
- Ostrom – John Ostrom (1928–2005)
- Oudemans – Anthonie Cornelis Oudemans (1858–1943)
- Oustalet – Emile Oustalet (1844–1905)
- Owen – Richard Owen (1804–1892)
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