| Abbreviation | Definition |
|---|---|
| CST | Catholic Social Teaching |
| CSTI | Christian Service Training Institute |
| CStJ | Commander of the Venerable Order of the Hospital of St. John of Jerusalam |
| CSTL | Congregation Shaarei Tefilah Lubavitch |
| CSUC | Chatswood South Uniting Church |
| CSUC | Cochrane Street United Church |
| CSUO | Christian Social Uplift Organization |
| CSVF | Church of Saint Vincent Ferrer |
| CSVP | Catholic School Voucher Program |
| CSW | Childrens' School of Worship |
| CSZB | Christian Schulte Zu Berge (German: Christian Schulte to Mountains; video gaming) |
| CT | Classical Theism |
| CTA | Christ Throughout Asia |
| CTA | Christian Tools of Affirmation |
| CTB | Come To Be |
| CTBH | Christian Temperance And Bible Hygiene |
| CTBN | Christian Television Broadcasting Network |
| CTC | Committed To Christ |
| CTCA | Christ Trinity Christian Academy |
| CTCS | Calvary Temple Christian School |