| Acronym | Definition |
|---|
| IBR | Income Based Repayment (Federal student loans) |
| IBR | Incorporated By Reference |
| IBR | Infectious Bovine Rhinotracheitis |
| IBR | Image-Based Rendering |
| IBR | Integrated Baseline Review |
| IBR | Iron Butt Rally (Iron Butt Association motorcycle event) |
| IBR | Institute of Behavioral Research |
| IBR | Incident-Based Reporting (crime statistics reporting to replace the UCR) |
| IBR | International Bear Rendezvous |
| IBR | International Bio Recovery (Corporation; North Vancouver, BC, Canada) |
| IBR | Independent Business Review (unbiased analysis) |
| IBR | Indian Boiler Regulation (Act) |
| IBR | Institute for Biblical Research |
| IBR | Independent Bird Register (UK) |
| IBR | Integrally Bladed Rotor (jet engine part) |
| IBR | Intelligence Broadcast Receiver |
| IBR | Industrie Bilance Riunite (Italian: Industry Balance Cases; Italy) |
| IBR | Inclusion Body Rhinitis |
| IBR | Initial Baseline Review |
| IBR | Internet Background Radiation |
| IBR | Investment Balance Review |
| IBR | Inverted Box Rib (building material) |
| IBR | It's Been Real |
| IBR | Innovation and Business Relations |
| IBR | In-Band Request |
| IBR | Institute of Byzantine Research (Athens, Greece) |
| IBR | Internal Baseline Review |
| IBR | Investment Budget Review |
| IBR | Installation Business Reform |
| IBR | Inappropriate Behavior Referral |
| IBR | Internal Budget Review |
| IBR | Intra-Base Radio |
| IBR | International Bull Riding |
| IBR | Interstate Background Research, Inc. (pre-employment screening; Elfers, FL) |
| IBR | Independent Bank Review |