PSR
- Abruzzo Airport
- Embedded DisplayPort
- Naked and Afraid
- PHP Standard Recommendation
- PSR-90
- Pacific School of Religion
- Palestinian Center for Policy and Survey Research
- Party of Socialists-Revolutionaries
- Pasir Ris MRT station
- Payment Systems Regulator
- Perimeter surveillance radar
- Physicians for Social Responsibility
- Pioneer Scout Reservation
- Polish Reason of State
- Portuguese Sign Language
- Posthumous sperm retrieval
- Potential support ratio
- Precision Sniper Rifle
- Precision scheduled railroading
- Predictive state representation
- Price–sales ratio
- Primary radar
- Principle of sufficient reason
- Problem Steps Recorder
- Profit and Sustainability Rules
- Pulsar
- Revolutionary Socialist Party (Portugal)
- Romanian Socialist Party (present-day)