PSR may refer to: Organizations Pacific School of Religion, Berkeley, California, US Palestinian Center for Policy and Survey Research Physicians for Social Responsibility, US Political parties Revolutionary Socialist Party (Portugal) (Partido Socialista Revolucionário) Romanian Socialist Party (present-day) Places Abruzzo Airport (IATA airport code), near Pescara, Italy Pasir Ris MRT station (MRT station abbreviation), Singapore Pioneer Scout Reservation, a Boy Scout camp in Ohio, US Science and technology Pulsar, a kind of star Primary radar Perimeter surveillance radar Posthumous sperm retrieval, from dead men Computing PHP Standard Recommendation Predictive state representation of a system Problem Steps Recorder, psr.exe, a Microsoft utility Panel self-refresh, in Embedded DisplayPort Law enforcement and military US Precision Sniper Rifle PSR-90, a Pakistani precision sniper rifle Other uses Portuguese Sign Language (ISO 639-3 language code) Potential support ratio, in demographics Precision scheduled railroading Price–sales ratio of stocks Primitive Survival Rating, on the Discovery Channel TV series Naked and Afraid Principle of sufficient reason