| Acronym | Definition |
|---|
| IRR➣Iranian Rial (ISO currency code) |
| IRR➣Internal Rate of Return |
| IRR➣Individual Ready Reserve |
| IRR➣Interest Rate Risk |
| IRR➣Irregular |
| IRR➣Internet Routing Registry |
| IRR➣Inactive Ready Reserve |
| IRR➣Institute for Religious Research (Grand Rapids, MI) |
| IRR➣Implementing Rules and Regulations |
| IRR➣Institute of Race Relations (UK) |
| IRR➣Integra Realty Resources (New York, NY) |
| IRR➣Initial Return Rate |
| IRR➣Infra Red Remote |
| IRR➣Interracial Relationship |
| IRR➣Independent Race and Refugee (news network; Institute of Race Relations) |
| IRR➣Intermediate Ring Road (India) |
| IRR➣Interrupt Request Register |
| IRR➣Indiana Rail Road |
| IRR➣Integral Rocket Ramjet (propulsion system) |
| IRR➣Inspection Rejection Report |
| IRR➣International Radio Regulations (various locations) |
| IRR➣Ionising Radiations Regulations |
| IRR➣Image Rejection Ratio |
| IRR➣Information Request Response |
| IRR➣In-Plan Roth Rollover (tax device) |
| IRR➣Investigative Records Repository |
| IRR➣Integrative Research Review (methodology) |
| IRR➣Infrared Reflectography |
| IRR➣Integrated Readiness Report (US DoD) |
| IRR➣Initial Response Resources |
| IRR➣Integrated Resource Recovery |
| IRR➣Individual Retirement Record |
| IRR➣Implementation Readiness Review |
| IRR➣Institute of Resource Recovery |
| IRR➣Integrated Radio Room |
| IRR➣Internal Recall Recorder (Telex Vega) |
| IRR➣Interface Requirements Review |
| IRR➣Infra-red Radiometer |
| IRR➣Immediate Reroute |
| IRR➣Initial Requirements Review |
| IRR➣Ionizing Radiations Regulations |
| IRR➣Initial Return Rate (TL 9000) |
| IRR➣Intelligence Radar Reporting |
| IRR➣Interim Research Review |
| IRR➣Independent Referencing Review |
| IRR➣Integral Rocket Engine |
| IRR➣Iron Road Railways, Inc. |
| IRR➣Inspect and Repair as Required |
| IRR➣Institute for the Recovery from Racisms |
| IRR➣Installation Readiness Report |
| IRR➣Infusion-Related Reaction |
| IRR➣Investment Return Ratio (economics) |
| IRR➣Issues Relating to Research |
| IRR➣Interference Reduction Ratio |