The taxon authority Orr may refer to:
- Albert G. Orr - Australian entomologist
- James Wilder Orr - U.S. ichthyologist
- Matthew Young Orr (1883-1953; Orr) - British botanist
- Michael Orr - U.S. entomologist
- Phil Cummings Orr (1903–1991) - U.S. palaeontologist
- Robert Thomas Orr (1908-1994) - U.S. biologist
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