| IRB | I Ref Badly 
| Others |
| IRB | Immigration and Refugee Board
| Others |
| IRB | Immigration Refugee Board
| Others |
| IRB | Improved Ribbon Bridge
| Others |
| IRB | Incident Report Book
| Others |
| IRB | Independent Reading Book
| Others |
| IRB | Independent Reading Books
| Others |
| IRB | Industrial Radiation Burns
| Others |
| IRB | Industrial Revenue Bond
| Others |
| IRB | Industry Reference Black
| Others |
| IRB | Inflatable Rescue Boat
| Others |
| IRB | Information Reader Box
| Others |
| IRB | Infra Red Blocking
| Others |
| IRB | Initial Ready Brigade
| Others |
| IRB | Inshore Rescue Boat
| Others |
| IRB | Institutional Review Board
| Others |
| IRB | Institutional Review Board (approves research protocols at hospitals)
| Others |
| IRB | Institutional Review BoardB
| Others |
| IRB | Institutional Review Boards
| Others |
| IRB | Instiutional Review Board
| Others |
| IRB | Integrated Routing and Bridging
| Others |
| IRB | Inter Repeater Backplane
| Others |
| IRB | Interface Requirements Board
| Others |
| IRB | Internal Rating Based
| Others |
| IRB | Internal Ratings Based
| Others |
| IRB | Internal Resources Bureau
| Others |
| IRB | Internal Revenue Bulletin
| Others |
| IRB | Internal Review Board
| Others |
| IRB | Internal Routing Board
| Others |
| IRB | International Republican Brotherhood
| Others |
| IRB | International Review Board
| Others |
| IRB | International Rugby Board
| Others |
| IRB | Internet Routing and Bridging
| Others |
| IRB | Interrupt Redirection Bitmap
| Others |
| IRB | Interrupt Response Block
| Others |
| IRB | Inventory Reduction Beer
| Others |
| IRB | Investigational Review Board
| Others |
| IRB | Investment Review Board
| Others |
| IRB | Iraan, Texas USA
| Others |