Perrin may refer to:
- Perrin Air Force Base, located in rural Grayson County, Texas
- Perrin friction factors, in hydrodynamics
- Perrin number, in mathematics
- Perrin's Beaked Whale, the newest species of Beaked Whale to be described (1975)
- Perrin's cave beetle, an extinct freshwater beetle from France
- Perrin, Texas, an unincorporated community in southeastern Jack County, Texas (USA)
- Perrin-Whitt Consolidated Independent School District, a public school district
- Towers Perrin, a global professional services firm
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