| Abbreviation | Definition |
|---|---|
| IPPC | Integrated Pollution Prevention And Control |
| IPPC | Intergovernmental Panel on Climate Change |
| IPPCL | Integrated Pollution Prevention Control License |
| IPPS | Industrial Pollution Projection System |
| IPSWM | Innovative Partnerships for Solid Waste Management |
| IPTI | Institute of Particulate Technology International |
| IPTM | Integrated Pesticide Transport Modeling |
| IQR | Industrial Quality Recycling |
| IRAA | Indoor Radon Abatement Act |
| IRBT | Iberian Rare Breeds Trust |
| IRE | International Recycling Expo |
| IRENA | International Renewable ENergy Agency |
| IRG | International Recycling Group |
| IRGP | Illinois Recycling Grants Program |
| IRN | Institutional Recycling Network |
| IRN | The Recycling Network |
| IRR | Institute of Restoration and Reclamation |
| IRSA | Indus River System Authority |
| IRSI | Industrial Recycling Solutions Inc |
| ISBE | International Society of the Built Environment |