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The taxon authority Olsen may refer to:
- Albert Mervyn Olsen (1917–2008), Australian bacteriologist, ichthyologist, and biochemist, also published as Mick Olsen.
- Jeanine Louise Olsen (born 1952, J.L.Olsen), phycologist
- Jerry Olsen, Australian ornithologist
- John S. Olsen (born 1950; Olsen), botanist
- Paul Eric Olsen, palaeontologist
- Richard T. Olsen (R.T.Olsen), botanist