| Abbreviation | Definition |
|---|---|
| CFFCU | Chattanooga First Federal Credit Union |
| CFFCU | Community First Federal Credit Union |
| CFFCU | Community Focus Federal Credit Union |
| CFFCU | Compass Financial Federal Credit Union |
| CFFCU | Cy Fair Federal Credit Union |
| CFL | Chicago Federation of Labor |
| CFMEU | Construction, Forestry, Mining and Energy Union (Australia) |
| CFMMEU | Construction Foresty Maritime Mining and Energy Union |
| CFNU | Canadian Federation of Nurses Unions |
| CFT | California Federation of Teachers |
| CFU | Caribbean Football Union |
| CFU | Croatian Fraternal Union |
| CGCU | City and Guilds College Union |
| CGCU | City Guilds College Union |
| CGL | Christian Gays and Lesbians Association |
| CGSU | Coleg Gwent Students Union |
| CGTU | Central General de Trabajadores Unitarios |
| CGU | Cornwall Golf Union |
| CHI | Chicago Union Amtrak Station |
| CHRU | Central Highlands Rugby Union |