| Abbreviation | Definition |
|---|---|
| IPEA | International Professional Engineer Agreement |
| IPPA | International Public Policy Analyst |
| IPR | Integrity Performance And Reliability |
| IPS | Individual Placement And Support |
| IPT | Integrated Physiological Trainer |
| IQ | Interview Question |
| IRA | Increased Retirement Advantages |
| IRA | Individual Retirement Arrangement |
| IRA | Irish Republican Activist |
| IRE | Institute of Radio Engineers |
| IRM | Integrated Resource Manager |
| IRM | International Relations Manager |
| IRPM | Information Resource Program Manager |
| IRs | Institutional Representatives |
| ISA | Independent Safety Assessor |
| ISBM | Injection Stretch Blow Molding |
| ISC | Independent Search Consultant |
| ISG | Indian Snake Giver |
| ISM | Interior Systems Mechanic |
| ISO | Independent Systems Operator |