IBR can refer to:
- Image-based modeling and rendering
- Income-Based Repayment Plan, a program related to student loans in the United States
- Indian Boiler Regulations
- Institute of Biomedical Research, at the University of Birmingham, UK
- Institute of Boiler and Radiator Manufacturers
- Integrally bladed rotor, a turbomachinery component
- International Bibliography of Book Reviews of Scholarly Literature and Social Sciences
- Inverted Box Rib, a type of metal roof
- Infectious bovine rhinotracheitis, a herpes-type viral disease of cattle
- the molecule iodine bromide (IBr)