| Acronym | Definition |
|---|
| PRI | Primary Rate Interface (ISDN) |
| PRI | Priority/Primary |
| PRI | Puerto Rico (ISO Country code) |
| PRI | Partido Revolucionario Institucional (Spanish: Institutional Revolutionary Party, México) |
| PRI | Institutional Revolutionary Party (Mexico) |
| PRI | Public Radio International |
| PRI | Performance Review Institute (Warrendale, PA) |
| PRI | Population Research Institute |
| PRI | Performance Racing Industry |
| PRI | Pacific Research Institute (since 1979; San Francisco, California) |
| PRI | Principles for Responsible Investment (UNEP Finance Initiative) |
| PRI | Plant Research International |
| PRI | Penal Reform International |
| PRI | Political Risk Insurance |
| PRI | Panchayati Raj Institutions (India) |
| PRI | Pharmaceutical Research Institute |
| PRI | Personal Record Identifier (Canada) |
| PRI | Pulse Repetition Interval |
| PRI | Photochemical Reflectance Index |
| PRI | Praslin Island, Seychelles (Airport Code) |
| PRI | Prevention Research Institute (Lexington, KY) |
| PRI | Periodic Reinvestigation |
| PRI | Performance Registrar Inc. |
| PRI | Prison Reform International |
| PRI | Plastics and Rubber Institute (United Kingdom) |
| PRI | Preliminary Rifle Instruction |
| PRI | Progressive Renal Insufficiency |
| PRI | Preemptive Repeat Identical (transition type in Petri nets) |
| PRI | Proliferation Rate Index |
| PRI | Polarity Realization Institute |
| PRI | Precision Radiation Instruments |
| PRI | Product Release Instructions |
| PRI | Positive Refractive Index |
| PRI | Paranormal Research Institute |
| PRI | Power Resources International, Inc (Long Island, New York) |
| PRI | Professional Recruiting International (Utah) |
| PRI | progressive routing indicator (US DoD) |
| PRI | Property Retention Index |
| PRI | Collectie Privaatrecht |
| PRI | Pensions Registration Institute (Sweden) |
| PRI | Partido de Ratas Inorganizadas |
| PRI | Planning, Review, and Inspection |
| PRI | Probability of Receiving an Impression |
| PRI | Pertech Resources Incorporated (Riverton, Wyoming) |
| PRI | Performance and Results International, LLC |
| PRI | Peroulakis Research, Inc. |