| Abbreviation | Definition |
|---|---|
| COIA | Coalition on Intercollegiate Athletics |
| COIA | Commission on Intercollegiate Athletics |
| CPAC | Cavalier Pride Athletic Center |
| CPAC | Central Plains Athletic Conference |
| CPAF | California Police Athletic Federation |
| CPL | Cyberathletic Professional League |
| CRAA | Coon Rapids Athletic Association |
| CSAA | Charter School Athletic Association |
| CSAC | California State Athletic Commission |
| CSAC | Colonial States Athletic Conference |
| CSAL | Catholic Schools Athletic League |
| CSAL | Charter School Athletic League |
| CTAA | Chesterfield Township Athletic Association |
| CTAA | Chinese Taipei Athletics Association |
| CTAA | Cranberry Township Athletic Association |
| CUAD | Concordia University Athletic Department |
| CUSG | Canadian University Science Games |
| CVAC | Carmel Valley Athletic Club |
| CVAC | Carolinas-Virginia Athletic Conference |
| CVAC | Cascade Vista Athletic Club |