Klein
The taxon authority Klein may refer to:
- Vera Lúcia Gomes-Klein (fl. 2003, Gomes-Klein) - botanist
- David-Paul Klein (fl. 2021, D.-P.Klein) - botanist
- Dirk Klein (fl. 2010, D.Klein) - botanist
- Edmond Joseph Klein, (1866-1942, E.J.Klein) - botanist
- Eduard Petrowitsch Klein, (fl. 1860, E.J.Klein) - botanist
- Erich Klein (1931–2016; E.Klein) - botanist
- William McKinley Klein (1933-1997, W.M.Klein) - botanist
- Frederick Karl Klein (fl. 1970, F.K.Klein) - botanist
- Jakob Theodor Klein (1685-1759, Klein) - botanist
- Jacques Klein (fl. 2013, Jacques Klein) - botanist
- Johann Gottfried Klein (1766-1821, J.G.Klein) - botanist
- Julius Klein (fl. 1870, J.Klein) - botanist
- Laura L. Klein (fl. 2010, L.L.Klein) - botanist
- Ludwig Klein (1857-1928, L.Klein) - botanist
- Lyudmila Nikolaevna Klein - ostracodologist
- Michael G. Klein - entomologist
- Nedra K. Klein - ornithologist
- Nicole Klein - palaeontologist
- Rainer Klein (fl. 1992, R.Klein) - botanist
- Roberto Miguel Klein (1923-1992, R.M.Klein) - botanist
- Sergio H. Klein (fl. 2017, S.H.Klein) - botanist
- Terry A. Klein - entomologist
- William E. Klein (fl. 1965, W.E.Klein) - botanist
- William McKinley Klein (1933-1997, W.M.Klein) - botanist