| Abbreviation | Definition |
|---|---|
| IRIS | Industrial Research Institute Swinburne |
| IRL | Independent Records Ltd |
| IRL | Interscape Records Ltd |
| IRP | Independent Research Provider |
| IRPM | Individual Risk Premium Modification |
| IRPPL | International Recreation Parks Private Limited (India) |
| IRPPL | International Recreation Parks Pvt Ltd |
| IRRI | Interstate Refrigerant Recovery INC |
| IRS | Independent RV Sellers |
| IRS | Information And Referral Services |
| IRSA | Inversiones y Rentas, S.A. |
| IRSI | Independent Rehabilitation Services Inc |
| IRSI | Independent Rehabilitation Services Inc. |
| IRSI | Industrial Recycling Solutions Inc |
| IRSI | International Research Services Inc |
| IRSL | InSitu Remediation Services Ltd |
| IRT | Integrated Recycling Technologies |
| IRTC | Intuitive Research and Technology Corporation |
| IRTC | Investment Recovery Trade Corporation |
| IRTI | Innovative Rehabilitation Technology Inc |