| Abbreviation | Definition |
|---|---|
| CUSC | Credit Union Service Corporation |
| CUSO | Credit Union Service Organizations |
| CUSU | Cambridge University Students Union |
| CUSU | Cambridge University Students' Union |
| CUSU | Cardiff University Students Union |
| CUSU | Cardiff University Students' Union |
| CUSU | Coventry University Students' Union |
| CUSW | Canadian Union of Skilled Workers |
| CUT | Caribbean Union of Teachers |
| CUTE | Canadian Union of Transportation Employees |
| CUTU | Champaign Urbana Tenants Union |
| CUWG | Control Union World Group |
| CUWS | Congressional Union for Woman Suffrage |
| CUZ | Chinese Union of Zurich |
| CVLU | Colne Valley Labour Union |
| CVTU | Central Valley Tenants Union |
| CVU | Champlain Valley Union |
| CWA | Communication Workers of America |
| CWCU | Central West Credit Union |
| CWCU | Central Wisconsin Credit Union |