The taxon authority Hansen may refer to:
- Alfred Hansen (A.Hansen) (1925–2008) - Botanist
- Aslak Kappel Hansen - Entomologist
- Bent Hansen - Danish zoologist
- Bertel Hansen- Botanist
- Bruce Frederick Hansen (B.F.Hansen) (1944- ) - Botanist
- Carlo Hansen (1932-1991; C.Hansen), botanist
- Eric Steen Hansen (E.S.Hansen) (1943- ) - Botanist
- Gerhard Armauer Hansen (1841-1912) - Botanist
- Hans Jacob Hansen (1855-1936) - Zoologist
- Hans Vilhelm Hansen (H.V.Hansen) (1951- ) - Botanist
- Jesper Guldberg Hansen - Cnidariologist
- Michael Hansen (1956-2000) - Coleopterologist
- Niels Ebbesen Hansen (N.E.Hansen) (1866-1950) - Botanist
- Ove Juel Hansen (born 1945; O.J.Hansen), botanist
- P. Arne Hansen, Danish-American bacteriologist
- Richard Maas Hansen (born 1924), mammalogist
- Victor Hansen (1889–1974) – Danish entomologist
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