| IRR | Illinois Radio Reader 
| Others |
| IRR | Immediate Reroute
| Others |
| IRR | Implementing Rules and Regulation
| Others |
| IRR | Implementing Rules And Regulations
| Others |
| IRR | Inactive Ready Reserve
| Others |
| IRR | Incidence Rate Ratio
| Others |
| IRR | Indian Reservation Roads
| Others |
| IRR | Individual Ready Reserve
| Others |
| IRR | Individual Ready Reserves
| Others |
| IRR | Infinity Random Race
| Others |
| IRR | Influenza Reagent Resource
| Others |
| IRR | Influenza Reagent Resources
| Others |
| IRR | Informatics Research Review
| Others |
| IRR | Information Request Response
| Others |
| IRR | Infra Red Remote
| Others |
| IRR | Infra Red Resistant
| Others |
| IRR | Infusion Related Reaction
| Others |
| IRR | Initial Return Rate
| Others |
| IRR | Inner Ring Road
| Others |
| IRR | Inspection Rejection Report
| Others |
| IRR | Institute for Religious Research
| Others |
| IRR | Institute of Race Relations
| Others |
| IRR | Institute of Restoration and Reclamation
| Others |
| IRR | Institutetute of Race Relations
| Others |
| IRR | Institutional Research and Reporting
| Others |
| IRR | Integra Realty Resources
| Others |
| IRR | Integral Rocket Ramjet
| Others |
| IRR | Integrated Radio Room
| Others |
| IRR | Integrated Readiness Report
| Others |
| IRR | Inter Rater Reliability
| Others |
| IRR | Interest Rate Risk
| Others |
| IRR | Internal Rate of Return
| Others |
| IRR | International Reagent Resources
| Others |
| IRR | International Rescue and Relief
| Others |
| IRR | Internet Related Resources
| Others |
| IRR | Internet Routing Registry
| Others |
| IRR | Interrupt Request Register
| Others |
| IRR | Inventory Removal Request
| Others |
| IRR | Ionizing Radiation Regulations
| Others |
| IRR | Iranian Rial
| Others |
| IRR | Issues Relating to Research
| Others |
| IRR | Italian Racing Red
| Others |
| IRR | The Individual Ready Reserves
| Others |