PSO

PSO may refer to:

In sport:

• Provincial Sport Organization
• Provincial Sport Organizations, are present in the provinces for multiple sports in Canada

In music:

• Peoria Symphony Orchestra
• Peterborough Symphony Orchestra, in Peterborough, Ontario, Canada
• Pittsburgh Symphony Orchestra
• Portland Symphony Orchestra

In science and technology:

• Particle Swarm Optimization, a swarm intelligence optimization technique
• Phase-shift oscillator, an electronic circuit that generates sine waves
• Protocol Support Organization, one of the three initial components of ICANN, later disbanded

Other uses:

• Pakistan State Oil
• 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
• Phantasy Star Online, a video game
• Phone sex operator, a person who provides phone sex service
• Public service obligation, a form of state subsidy for transport links which are not commercially viable
• Paysite operator, the operator of a paysite, typically pornographic
• Producers Sales Organization, an independent motion picture production and distribution company
• Professional service organization.