| Acronym | Definition |
|---|
| IPI | Imposto Sobre Produtos Industrializados (Brazilian Federal Excise Tax) |
| IPI | Imposto Sobre Produtos Industrializados (Brazil federal tax) |
| IPI | Istituto per la Promozione Industriale |
| IPI | Infinity Pharmaceuticals Inc. (Cambridge, MA) |
| IPI | International Protein Index |
| IPI | Image Permanence Institute (Rochester, New York) |
| IPI | Inter-Processor Interrupt |
| IPI | Independent Photo Imagers |
| IPI | Intel Product Integrator |
| IPI | Illinois Policy Institute |
| IPI | Interior Point Intermodal |
| IPI | Initial Protocol Identifier |
| IPI | Ipiales, Colombia - San Luis (Airport Code) |
| IPI | In Process Inspection |
| IPI | Information Policy Institute |
| IPI | Institute for Photogrammetry and Geoinformation |
| IPI | Intel Processor Integrator |
| IPI | International Petroleum Institute (est. 1987) |
| IPI | Information Products Interchange |
| IPI | Illinois Pain Institute |
| IPI | India Policy Institute |
| IPI | Index of Biotic Integrity |
| IPI | Industrial Product Identification |
| IPI | Indigenous Populations and Institutions (US DoD) |
| IPI | Irreversible Processed Indicator |
| IPI | Initial Product Inspection |
| IPI | Isocyanate Products Incorporated |
| IPI | Infinity Pharmaceuticals Incorporated (Cambridge, MA) |
| IPI | Instrument Personality Interface |
| IPI | Intercept Pattern for Identification |
| IPI | In-Process Initiative |
| IPI | Immediate Permanent Incapacitation (nuclear weapons casualty criterion) |
| IPI | In-grade Pay Increase |
| IPI | International Peace Institute (New York, NY) |
| IPI | Intrepid Potash, Inc. (Denver, CO) |
| IPI | Indigenous Peoples International (International Humanities Center) |
| IPI | International Payment Instruction |
| IPI | Institute for Policy Innovation |
| IPI | Intelligent Peripheral Interface |
| IPI | Internal Process Improvement |
| IPI | International Press Institute |
| IPI | Internet Policy Institute |
| IPI | International Prognostic Index (oncology) |
| IPI | International Public Information |
| IPI | Imaging Products International (photography) |
| IPI | Intellectual Property Interface |
| IPI | International Parking Institute |
| IPI | International Property Investors (various locations) |
| IPI | Institute of Pharmaceutical Innovation (University of Bradford, UK) |