The taxon authority Otto may refer to:
- Bernhard Christian Otto (1745-1835) (B.Otto) - botanist
- Carlos Frederico Eduardo Otto (1812-1885) (Ed.Otto) - botanist
- Christoph Friedrich Otto (1783-1856) (Otto), botanist
- E.C. Otto (fl. 2015) (E.C.Otto) - botanist
- Ernst von Otto (1799-1863) (E.Otto) - botanist
- Johann Gottfried Otto (1761-1832) (J.Otto) - botanist
- Jürgen C. Otto, arachnologist
- Markus Otto, palaeontologist
- Robert L. Otto, entomologist
- R. Otto (fl. 2008; R.Otto), botanist
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