PRI
- Cromemco PRI
- Independent Regionalist Party
- Institutional Republican Party
- Institutional Revolutionary Party
- Italian Republican Party
- PRI Records
- PRI disease resistant apple breeding program
- Pacific Research Institute
- Paleontological Research Institution
- Penal Reform International
- Perceptual Reasoning Index
- Performance Racing Industry
- Photochemical Reflectance Index
- Population Research Institute (organization)
- Prairie Research Institute
- Praslin Island Airport
- Primary Rate Interface
- Principles for Responsible Investment
- Public Radio International
- Puerto Rico
- Pulse repetition interval