Klein
The taxon authority Klein may refer to:
- Vera Lúcia Gomes-Klein (fl. 2003, Gomes-Klein) - botanist
- Erich Klein (1931–2016; E.Klein) - botanist
- Jakob Theodor Klein (1685-1759, Klein) - botanist
- Lyudmila Nikolaevna Klein - ostracodologist
- Nedra K. Klein - ornithologist
- Nicole Klein - palaeontologist
- Terry A. Klein - entomologist