The taxon authority Arnold may refer to:
- Chester A. Arnold (1901–1977), American paleobotanist
- Don C. Arnold, U.S. entomologist
- Douglas L. Arnold, herpetologist
- Edwin Nicholas Arnold (born 1940), British herpetologist
- Ferdinand Christian Gustav Arnold (1829–1901; Arnold), lichenologist
- George Arnold (1881–1962), entomologist
- Johann Franz Xaver Arnold (1730–1801), German botanist
- Paula Arnold (fl. 1972; P.Arnold), mycologist
- Rachel J. Arnold
- Spencer Arnold, malacologist
- Trevor Henry Arnold (born 1947; T.H.Arnold), botanist
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