| Abbreviation | Definition |
|---|---|
| CTRF | Christian Theological Research Fellowship |
| CTS | Catholic Truth Society |
| CTS | Celebrate The Spirit |
| CTS | Christian Team Server |
| CTS | Christian Theological Seminary |
| CTS | Continental Theological Seminary |
| CTSA | Catholic Television of San Antonio |
| CTSA | Catholic Theological Society of America |
| CTSLC | Christ The Servant Lutheran Church |
| CTSO | Catholic Tuition Support Organization |
| CTTB | City Of Ten Thousand Buddahs |
| CTTY | Catholic Through The Year |
| CTW | Commended to The Word |
| CU | Christian Union |
| CUC | Canadian Unitarian Council |
| CUCF | Communion of United Christian Fellowships |
| CUCU | Cardiff University Christian Union |
| CUE | Christian Union Endeavours |
| CUEA | Catholic University of Eastern Africa |
| CUFFS | Christians United for Fun Fellowship and Service |