| Acronym | Definition |
|---|
| PSO➣Particle Swarm Optimization |
| PSO➣Phantasy Star Online |
| PSO➣Pakistan State Oil |
| PSO➣psoriasis |
| PSO➣Polycystic Ovary Syndrome |
| PSO➣Penalty Shoot-Out (football / soccer) |
| PSO➣Pressure Shut Off |
| PSO➣Patient Safety Organization (Rockville, MD) |
| PSO➣Phone Sex Operator |
| PSO➣Power System Operator (various locations) |
| PSO➣Peace and Stability Operations (US Army) |
| PSO➣Princeton Symphony Orchestra (Princeton, NJ) |
| PSO➣Portland Symphony Orchestra (since 1923; Portland, Maine) |
| PSO➣Pedicle Subtraction Osteotomy (neurosurgery) |
| PSO➣Provisioning Service Object |
| PSO➣Progressive Scan Output |
| PSO➣Plastic Small Outline Package |
| PSO➣Photo Studio Optimizer |
| PSO➣Peace Support Operation |
| PSO➣Public Service Obligation (chiefly European) |
| PSO➣Parent Support Organization |
| PSO➣Port Security Officer |
| PSO➣Prozess Standard Offsetdruck (German: Process Standard Offset) |
| PSO➣Pre-Service Orientation (various organizations) |
| PSO➣Principal Scientific Officer |
| PSO➣Professional Services Organization |
| PSO➣Protected Species Observer |
| PSO➣Public Safety Officer |
| PSO➣Project Support Office (project management) |
| PSO➣Provider Sponsored Organization |
| PSO➣Professional Staff Organization (various organizations) |
| PSO➣Provincial Sport Organization (Canada) |
| PSO➣Post Security Officer (US DoD) |
| PSO➣Prohibited Steps Order (UK court order) |
| PSO➣Protocol Supporting Organization (ETSI, IETF, ITU, W3C Consortium) |
| PSO➣Proprietary Security Officer (various companies) |
| PSO➣Philips Symfonie Orkest (Dutch: Philips Symphony Orchestra) |
| PSO➣Poker Source Online (gambling) |
| PSO➣Product Support Office |
| PSO➣Policy Support Officer (various locations) |
| PSO➣Political Science Organization (various locations) |
| PSO➣Public Service of Oklahoma |
| PSO➣Private Sector Operator |
| PSO➣Personal Service Organization |
| PSO➣Post Secondary Option (education) |
| PSO➣Product and Service Offer |
| PSO➣Program Secretarial Officer |
| PSO➣Password Settings Object |
| PSO➣Processing Services Operation (Sprint) |
| PSO➣Peoria Symphony Orchestra (Illinois) |
| PSO➣Partner Solution Offering (Dell) |
| PSO➣Partnership for Sustainable Oceans |
| PSO➣Provisioning Service Object (computing) |
| PSO➣Pantex Site Office (Amarillo, TX) |
| PSO➣Prep Sports Online (high school sports websites) |
| PSO➣Process Sign-Off |
| PSO➣PlayStationOne |
| PSO➣Parcel Shipping Order (various companies) |
| PSO➣Paralegal Society of Ontario |
| PSO➣Pasto, Colombia - Cano (Airport Code) |
| PSO➣Participating Standards Organization |
| PSO➣Publicity Security Officer (US Navy) |
| PSO➣Piano-Shaped Object (shoddily made or badly damaged piano) |
| PSO➣Portsmouth Symphony Orchestra (Portsmouth, OH) |
| PSO➣Procurement Support Office |
| PSO➣Pembroke Symphony Orchestra (Canada) |
| PSO➣Peter Skene Ogden Secondary (school) |
| PSO➣Production Sign Off |
| PSO➣Plan de Sécurité Opérateur (French: Safety Plan Operator) |
| PSO➣Permanent Slow Order (railway) |
| PSO➣Project Safety Officer |
| PSO➣Primary Strike Objective |
| PSO➣Protectseniors.org (Washington, DC lobby) |
| PSO➣Primary Standardization Office |
| PSO➣Practice/Study/Observation (various universities) |
| PSO➣Program Staff Office/Officer |
| PSO➣Provisions Supply Office |
| PSO➣Preliminary Screening Officer |
| PSO➣Possible Survivable Options |
| PSO➣Project Step Off |
| PSO➣Payload Sensor Operator |
| PSO➣Proud Social Outcast |
| PSO➣Policy Service Office (insurance) |
| PSO➣Primary Support Official |
| PSO➣Plan for Safe Operation |
| PSO➣Parma Symphony Orchestra (Parma, OH) |
| PSO➣Polysporin Ointment |