The taxon author Clausen may refer to:
- Andrea Martina Clausen, botanist (A.M.Clausen)
- Claus Clausen, zoologist
- Herluf Stenholt Clausen, ichthyologist
- Jens Christian Clausen, botanist (1891–1969) (J.C.Clausen)
- Pedro Cláudio Dinamarquez Clausen, botanist (?–1855) (Clausen)
- Robert Theodore Clausen, botanist (1911–1981) (R.T.Clausen)
- Roy Elwood Clausen, botanist (1891–1956) (R.E.Clausen)
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