PSO
PSO stands for:
- Particle swarm optimization, an optimization algorithm based on swarm intelligence
- Pakistan State Oil , a Pakistani petroleum company, see List of Petroleum Companies #Alphabetic List of Companies
- Parliamentary Forum of the Southern Baltic Sea , a forum for the regional representative bodies of several Baltic Sea countries
- Peace Support Operation , military and civilian measures to secure or restore peace
- Phantasy Star Online , a multiplayer role-playing game from Sega for game consoles and PCs
- Process standard offset , industrial and standardized production of printed matter
- Penalty Shoot Out, penalty shootout in football
- PSO-1 , a rifle scope of Soviet origin
pso stands for:
- Polski Język Migowy (ISO-639-3 code), Polish sign language