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PSOPublic Service Obligation (chiefly European)
PSOProfessional Services Organization
PSOPublic Safety Officer
PSOProject Support Office (project management)
PSOProvider Sponsored Organization
PSOProvincial Sport Organization (Canada)
PSOProtocol Supporting Organization (ETSI, IETF, ITU, W3C Consortium)
PSOPublic Service of Oklahoma
PSOProgram Secretarial Officer
PSOPassword Settings Object
PSOPeoria Symphony Orchestra (Illinois)
PSOProcess Sign-Off
PSOpost security officer (US DoD)
PSOParalegal Society of Ontario
PSOPasto, Colombia - Cano (Airport Code)
PSOParticipating Standards Organization
PSOPiano-Shaped Object (shoddily made or badly damaged piano)
PSOPortsmouth Symphony Orchestra (Portsmouth, OH)
PSOProcurement Support Office
PSOPembroke Symphony Orchestra (Canada)
PSOPeter Skene Ogden Secondary (school)
PSOPlan de Sécurité Opérateur (French: Safety Plan Operator)
PSOProduction Sign Off
PSOProject Safety Officer
PSOPermanent Slow Order (railway) (Washington, DC lobby)
PSOPrimary Strike Objective
PSOPractice/Study/Observation (various universities)
PSOPrimary Standardization Office
PSOProgram Staff Office/Officer
PSOProvisions Supply Office
PSOPreliminary Screening Officer
PSOProud Social Outcast
PSOPossible Survivable Options
PSOProject Step Off
PSOPayload Sensor Operator
PSOPrimary Support Official
PSOPolicy Service Office (insurance)
PSOPlan for Safe Operation
PSOParma Symphony Orchestra (Parma, OH)
PSOPolysporin Ointment
PSOPakistan State Oil
PSOPolycystic Ovary Syndrome
PSOPort Security Officer
PSOPartner Solution Offering (Dell)
PSOProfessional Staff Organization (various organizations)
PSOPenalty Shoot-Out (football / soccer)
PSOPrincipal Scientific Officer
PSOPersonal Service Organization
PSOPressure Shut Off
PSOPrep Sports Online (high school sports websites)
PSOPatient Safety Organization (Rockville, MD)
PSOPortland Symphony Orchestra (since 1923; Portland, Maine)
PSOPoker Source Online (gambling)
PSOPhone Sex Operator
PSOParent Support Organization
PSOPost Secondary Option (education)
PSOParticle Swarm Optimization
PSOPeace Support Operation
PSOPhantasy Star Online
PSOProcessing Services Operation (Sprint)
PSOProduct and Service Offer
PSOProduct Support Office