| Abbreviation | Definition |
|---|---|
| CMVL | Catholic Metro Volleyball League |
| CNA | Catholic News Agency |
| CND | Congrégation de Notre Dame |
| CNEC | Christian Nationals Evangelism Commission |
| CNI | Catholic Nonviolence Initiative |
| CNI | Christian Nightlife Initiatives |
| CNML | Catholic Nursing Mothers League |
| CNN | Catholic News Numbnuts |
| CNN | Christian News Network |
| CNN | Cornerstone Network News |
| CNOB | Central, Northeastern Ontario and Bermuda (a synod of the Presbyterian Church in Canada) |
| CNVNT | Convent |
| CNY | Catholic New York |
| COA | Children Of Apocolypse |
| COA | Christians Of Age |
| COACH | Considerate, Optimist, Attentive, Confident, and Humanistic |
| COAP | Christian Outreach with Appalachian People |
| COAST | Coming Of Age Spiritual Trek |
| COB | Christian Online Buddy |
| COBA | Celtic Order of benedictine Adorationists |