PSO
The abbreviation stands for PSO:
- Peace Support Operation, military and civilian measures to safeguard or restore peace
- Phantasy Star Online, a multiplayer role playing game by Sega for game consoles and PCs
- Process Standard Offset, industrial and standardized production of printed materials
- Particle Swarm Optimization, a based on swarm intelligence optimization algorithm
- Pakistan State Oil, a Pakistani oil company
- Parliamentary Forum Southern Baltic Sea, a forum of regional representative bodies of several Baltic Sea countries
- Disambiguation
- Abbreviation