| Abbreviation | Definition |
|---|---|
| CGGS | Canberra Girls' Grammar School |
| CGHS | Cardinal Gibbons High School |
| CGHS | Casa Grande High School |
| CGHS | Cedar Grove High School |
| CGHS | Center Grove High School |
| CGHS | Central Gwinnett High School |
| CGHS | Conservatory Green High School |
| CGHS | Coral Gables High School |
| CGHS | Coral Glades High School |
| CGHS | Cottage Grove High School |
| CGHS | Cottage Grove OR High School |
| CGHS | Council Grove High School |
| CGHS | Cumberland Gap High School |
| CGMA | Country Garden Montessori Academy |
| CGPA | Cumulative Grade Point Average |
| CGPS | Columbia Grammar & Preparatory School |
| CGPS | Columbia Grammar and Preparatory School |
| CGS | Camberwell Grammar School |
| CGS | Canberra Grammar School |
| CGS | Commonwealth Governor's School |