| CSOS | California School of Organizational Studies 
| Others |
| CSOS | Center for Social Organization of Schools
| Others |
| CSOS | Central States Orthopedic Specialists
| Others |
| CSOS | Child Support Online Services
| Others |
| CSOS | Chinese Speaking Orthopaedic Society
| Others |
| CSOS | Christian Schools of Springfield
| Others |
| CSOS | Civil Society Organisation Support
| Others |
| CSOS | Communications Switch Operating System
| Others |
| CSOS | Composite Signals Organisation Station
| Others |
| CSOS | Confidential Statement Of Support
| Others |
| CSOS | Conservation of Sculpture and Objects Studio
| Others |
| CSOS | Controlled Substance Ordering System
| Others |
| CSOS | Controlled Substances Ordering System
| Others |
| CSOS | Customer Service Oriented Service
| Others |
| CSOS | Cyber Security Operations Specialist
| Others |
| CSOS | Cypress School of Skating
| Others |