| Abbreviation | Definition |
|---|---|
| CGC | Conspicuous Gallantry Cross (UK military) |
| CGCS | Certified Golf Course Superintendent |
| CGMM | Canon Garland Memorial Medal |
| CGN | Canine Good Neighbor |
| CGR | Certified Graduate Remodelor |
| CGS | Clay Guardian Shield |
| CH | Companion of Honour [in the UK] |
| CHDA | Certified Health Data Analyst |
| CHHHA | Certified Homemaker Home Health Aide |
| CHHP | Certified Holistic Health Practitioner |
| CHT | Certified Hemodialysis Technologist |
| CIASC | CSIR Innovation Award for School Children |
| CIB | Combat Infantryman Badge |
| CID | Certified Irrigation Designer |
| CIFI | Certified Information Forensics Investigator |
| CIFI | Certified Insurance Fraud Investigator |
| CIM | Certificate of Initial Mastery |
| CIMA | Catholics In Media Award |
| CIO | Companion of the Imperial Order |
| CIOWTS | Certified Installer of On-site Wastewater Treatment Systems |