| Acronym | Definition |
|---|
| PIRS | Passive Infrared Sensor |
| PIRS | Papers in Regional Science (journal) |
| PIRS | Public Information and Reference Service |
| PIRS | Project Information Retrieval System |
| PIRS | Poslovni Informator Republike Slovenije (Business Directory of Republic of Slovenia) |
| PIRS | Police Information Retrieval System (database; Canada) |
| PIRS | Parliamentary Information and Research Service (Canada) |
| PIRS | Pacific Immigrant Resources Society (Vancouver, British Columbia, Canada) |
| PIRS | Propulsion Information Retrieval System |
| PIRS | Pangaea International Receivable Services (Kalispell, MT) |
| PIRS | Pollution Incident Reporting System |
| PIRS | Personnel Information Reporting System |
| PIRS | Pulsed Infrared System |
| PIRS | Patent Image Retrieval System |
| PIRS | FCC Public Information and Reference Services |