Thomas
The taxon authority Thomas may refer to:
- A.P. Thomas (fl. 2016), Indian annelidologist
- Annick Le Thomas (born 1936; Le Thomas), French botanist
- Arianna Thomas (fl. 2017), Venezuelan entomologist
- Asha Thomas (fl. 2015), Indian entomologist
- B.W. Thomas (fl. 1981), New Zealand herpetologist
- Berthold Ernst Friedrich Thomas (1910–?; B.Thomas), German botanist
- Bethia Thomas (fl. 2010), palaeontologist
- Charles Arden Thomas (fl. 1938–1973; C.A.Thomas), botanist
- Christian M. Thomas, phycologist
- Cyrus Thomas (1825–1910; C.Thomas), U.S. entomologist and botanist
- Donald B. Thomas (fl. 1974), U.S. entomologist
- Duncan W. Thomas (fl. 1986; D.W.Thomas), botanist
- Eugen A. Thomas (1912–1986; E.A.Thomas), Swiss naturalist (limnology and lichenology)
- Gavin H. Thomas (fl. 2009), herpetologist
- Hans-Peter Thomas (fl. 2001; H.P.Thomas), botanist
- Herbert Thomas (fl. 1987), French palaeontologist
- Hugh Hamshaw Thomas (1885–1962; H.H.Thomas), British botanist
- J.C. Thomas (fl. 1982; J.C.Thomas), phycologist
- James Darwin Thomas (fl. 2015), U.S. carcinologist
- Jennifer C. Thomas (fl. 2017), U.S. entomologist
- Jinesh P. Thomas (fl. 2015), Indian ichthyologist
- John Hunter Thomas (1928–1999; J.H.Thomas), U.S. botanist
- Lowell P. Thomas, American marine biologist
- Matthew R. Thomas (fl. 2015), U.S. ichthyologist
- Michael Charles Thomas (1948–2019), U.S. entomologist
- Michael Jared Thomas (fl. 2017), U.S. entomologist
- Oldfield Thomas (1858–1929; Thomas), English zoologist
- (John Paul) Richard Thomas (born 1938), U.S. herpetologist
- Richard H. Thomas (fl. 1998), British zoologist
- Robert Allen Thomas (fl. 1974), U.S. herpetologist
- Sabu K. Thomas (fl. 2018), Indian entomologist
- Sarah Thomas (born 1968; S.Thomas), English botanist
- Sinjumol Thomas (fl. 2015; Sinj.Thomas), Indian botanist
- William Wayt Thomas (born 1951; W.W.Thomas), U.S. botanist