| COSC | Cabin Operations Safety Conference 
| Others |
| COSC | Cambridge Overseas School Certificate
| Others |
| COSC | Cambuslang Out of School Care
| Others |
| COSC | Certified Orthopaedic Surgery Coder
| Others |
| COSC | Charter Oak State College
| Others |
| COSC | Chief Okemos Sportsman's Club
| Others |
| COSC | Chiefs Of Staff Committee
| Others |
| COSC | Clerk of the Superior Court
| Others |
| COSC | Collisional Orogeny in the Scandinavian Caledonides
| Others |
| COSC | Colorado Outdoor Stewardship Coalition
| Others |
| COSC | Combat and Operational Stress Control
| Others |
| COSC | Combat Operational Stress Control
| Others |
| COSC | Combat Operational Stress Control (USMC)
| Others |
| COSC | Committee Of School Councils
| Others |
| COSC | Committee On Student Conduct
| Others |
| COSC | Computer Operations Service Center
| Others |
| COSC | Continuity Of Services Contract
| Others |
| COSC | Controle Official Suisse des Chronometers
| Others |
| COSC | Controle Officiel Suisse des Chronometer
| Others |
| COSC | Controle Officiel Suisse des Chronometres
| Others |
| COSC | Corvettes Of Sonoma County
| Others |
| COSC | Council of State Chambers
| Others |