Orr
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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