| IBRS | Idaho Business Registration System 
| Others |
| IBRS | Incident Base Reporting System
| Others |
| IBRS | Indiana Birth Registration System
| Others |
| IBRS | Indirect Branch Restricted Speculation
| Others |
| IBRS | Insane Black Rock Shooter
| Others |
| IBRS | Integrated Ballistic Reticle System
| Others |
| IBRS | Integrated Ballistic Reticle Systme
| Others |
| IBRS | Integrated Benefit Recovery System
| Others |
| IBRS | Integrated Business Research Systems
| Others |
| IBRS | Intelligent Business Research Services
| Others |
| IBRS | Inter Branch Reconciliation System
| Others |
| IBRS | Interdisciplinary Biomedical Research Symposium
| Others |
| IBRS | International Business Reply Service
| Others |
| IBRS | International Business Reply Services
| Others |
| IBRS | International Business Response Service
| Others |
| IBRS | Internet Based Registration Service
| Others |
| IBRS | Internet Based Registration System
| Others |
| IBRS | Interview Based Rating Scale
| Others |