| Acronym | Definition |
|---|
| BIR | British Institute of Radiology |
| BIR | Bureau of Internal Revenue |
| BIR | Bureau of International Recycling |
| BIR | Brain Injury Rehabilitation (various organizations) |
| BIR | Ball in Ramp |
| BIR | Band Instrument Repair (various schools) |
| BIR | Buchanan Ingersoll & Rooney (law firm; Pittsburgh; PA) |
| BIR | Bataillon d'Intervention Rapide (French: Rapid Intervention Battalion; Cameroon) |
| BIR | Baculovirus IAP Repeat |
| BIR | Business Informatics Research |
| BIR | Biomedical Imaging Resource |
| BIR | Bureau of Intelligence and Research (US State Department) |
| BIR | Badatz Igud Rabbonim (Kosher Food Certification Agency) |
| BIR | Biometric Identification Record |
| BIR | Built in Wardrobe |
| BIR | Bâtiment Industrie Réseaux (French: Building Industry Networks) |
| BIR | Basic Individual Record |
| BIR | Built-in Rigid (plumbing) |
| BIR | Beta-Cell Inward Rectifier Subunit |
| BIR | Banque d'Information sur les Recherches |
| BIR | Bretagne Internet Réseaux (French: Brittany Internet Networks; Rennes, Brittany, France) |
| BIR | Benefit/Investment Ratio |
| BIR | Best Incremental Return |
| BIR | Biological Impact Report |
| BIR | Boulons Industriels Rouville (French) |
| BIR | Brother in Room |
| BIR | Business Information Records |
| BIR | Burn-In Reliability |