The taxon authority Christiansen may refer to:
- Kenneth A. Christiansen, U.S. entomologist
- Mads Peter Christiansen (1889–1975, M.P.Christ.), botanist and mycologist
- Per Christiansen, Danish palaeontologist
- Mogens Skytte Christiansen (1918–1997, M.S.Christ.), Danish lichenologist
- Søren Grøntved Christiansen (S.G.Christ.), botanist
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