Nielsen

The taxon authority Nielsen may refer to:

Anker Nielsen (1907–1984), Danish entomologist
Boy Overgaard Nielsen (1934–2022), Danish entomologist
Cesare Nielsen (1898–1984), Italian odonatologist
Claus Nielsen, bryozoologist
Dalton Tavares Bressane Nielsen, ichthyologist
Ebbe Schmidt Nielsen (Nielsen, 1950–2001), Danish entomologist
Eigil Nielsen, palaeontologist
Etlar Lester Nielsen, (E.L.Nielsen, 1905–2000), U.S. botanist
Gregory J. Nielsen - entomologist
Howie Nielsen, ornithologist
Ivan Christian Nielsen, (I.C.Nielsen, 1946–2007), Danish botanist and palaeontologist
J. Rasmus Nielsen, ichthyologist
Jens Christian Nielsen (1881–1918), Danish entomologist
Jørgen G. Nielsen, Danish ichthyologist
Kristian Brünnich Nielsen, (1872-1942), Danish echinodermologist, paleontologist
Lewis Thomas Nielsen (1920–2014), U.S. entomologist
Peder Nielsen (1893–1975), Danish entomologist
Peter Nielsen (1829–1897; Nielsen), Danish botanist
Ruth Nielsen (born 1944, R.Nielsen), phycologist
Søren Achim Nielsen (1955–2019), Danish entomologist
Stuart V. Nielsen, herpetologist
Tore Randulff Nielsen (1938–), Norwegian entomologist

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