CSOS
| Acronym | Definition |
|---|---|
| CSOS | Center for Social Organization of Schools |
| CSOS | Controlled Substances Ordering System (US DEA) |
| CSOS | Central States Orthopedic Specialists (Oklahoma) |
| CSOS | Company Share Option Scheme (various organizations) |
| CSOS | California School of Organizational Studies |
| CSOS | Cypress School of Skating (Medicine Hat, Alberta, Canada) |