- PSO
PSO may refer to:
*Pakistan State Oil
*Particle Swarm Optimization - a swarm intelligence optimization technique
*Paysite operator - the owner/operator of apaysite
*Peace Support Operations - an international collection of armed forces intended to observe peace, generally under UN auspices
*Penalty shootout - a method of determining a winner in sports matches which would have otherwise been drawn or tied
*Peterborough Symphony Orchestra - in Peterborough, Ontario, Canada
*Phantasy Star Online - a video game
*Phase-shift oscillator - an electronic circuit that generates sine waves
*Phone sex operator - a person who provides phone sex service
*Phonic Sonic Oradea - electronic music community ofOradea
*Piano Shaped Object - a third-rate or worn-outpiano ; a piano brand scorned by technicians and tuners
*Pittsburgh Symphony Orchestra
*Protocol Support Organization - one of the three initial components ofICANN , later disbanded
*Public service obligation - a form of state subsidy for transport links which are not commercially viable
*Professional Services Organization
*Ports and Shipping Organization - the organization which run and authorized Iranian ports.
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