IBR
- IBRS (disambiguation)
- Ibaraki Airport
- Image-based modeling and rendering
- Income-based repayment
- Incorporation by reference
- Infectious bovine rhinotracheitis
- Integrally bladed rotor
- International Bibliography of Book Reviews of Scholarly Literature and Social Sciences
- Internet background radiation
- Inverter-based resource
- Iodine monobromide
- Ivey Business School
- University of Birmingham