The taxon authority Clark may refer to:

• Ailsa McGown Clark, paleontologist
• Austin Hobart Clark (1880,1954), U.S. zoologist
• Benjamin Preston Clark (1860–1939), U.S. entomologist
• Bruce L. Clark (1880–1945), U.S. micropaleontologist and geologist
• David Leigh Clark, ostracodologist
• Douglas John Clark (1929–71), arachnologist
• Elizabeth G. Clark, palaeontologist
• Erica D. Clark, herpetologist
• Eugenie Clark (born 1922), U.S. ichthyologist
• Ellen Clark (1915–1988)
• George Archibald Clark (1864–1918), academic secretary to David Starr Jordan
• Gowan C. Clark (1888–1964), lepidopterist
• Hamlet Clark (1823–1867), English clergyman and naturalist
• Helen E.S. Clark, New Zealand zoologist
• Henry James Clark (1826–1873), U.S. naturalist
• Howard Walton Clark (1870–1941), U.S. ichthyologist
• Hubert Lyman Clark (1870–1947), U.S. zoologist
• James Curtis Clark (born 1951; C.Clark), botanist
• Janice Clark, U.S. carcinologist
• John Clark (1885–1956), Scottish-Australian myrmecologist
• John L. Clark (J.L.Clark), botanist
• John M. Clark, New Zealand acarologist
• Linda L. Clark, U.S. bacteriologist
• Lynn G. Clark (born 1956; L.G.Clark), U.S. botanist
• Malcolm R. Clark, carcinologist
• Paul F. Clark, carcinologist
• Richard J. Clark, herpetologist
• Robert Selbie Clark (1882–1950), Scottish marine zoologist
• Roger N. Clark, marine zoologist
• Shawn M. Clark, entomologist
• Stephanie A. Clark, malacologist
• Thomas H. Clark (1893–1996), British-Canadian geologist and paleontologist
• W.C. Clark, New Zealand nematologist