- BARR stands for Block Aircraft Registration Request (National Business Aviation Association)
- BARR stands for British Association of Road Races (est. 1984; UK)
- BARR stands for Board on Agriculture and Renewable Resources (Washington, DC, USA)
- BARR stands for Bump and Run Reversal (stock trading)
- BARR stands for Blissful Acres Rescue Reserve (Bend, OR)
- BARR stands for Bureau of Aeronautics Resident Representative
BARR