| Abbreviation | Definition |
|---|---|
| CFFB | CrossFit Football's |
| CFL | Campbell Football League |
| CFL | Canadian Football League |
| CFMC | Centerville Football Mothers Club |
| CFN | Canadian Football Network |
| CFOA | Colorado Football Officials Association |
| CFP | College Football Playoff College Football Playoff |
| CFRC | College Football Research Center |
| CFT | College Football Talk |
| CFX | Chargers Football Xtra |
| CGFC | Caulfield Grammarians Football Club |
| CGSFL | Central Great Southern Football League |
| CHFL | Central Highlands Football League |
| CIA | Cardinals In Action |
| CIF | Champions Indoor Football |
| CIFA | Cayman Islands Football Association |
| CIFA | Cook Islands Football Association |
| CIFFA | Cayman Islands Flag Football Association |
| CIFL | Continental Indoor Football League |
| CJFL | Canadian Junior Football League |