| Abbreviation | Definition |
|---|---|
| GISC | German International School Chicago |
| GISD | Gadsden Independent School District |
| GISD | Gainesville Independent School District |
| GISD | Galveston Independent School District |
| GISD | Garland Independent School District |
| GISD | Genesee Intermediate School District |
| GISD | Georgetown Independent School District |
| GISJ | German International School Jeddah |
| GISS | Gan Imtermate Secondary School |
| GISS | German International School Sydney |
| GISS | Gordonstoun International Summer School |
| GISS | Gulf Islands Secondary School |
| GISW | German International School Washington |
| GJHS | George Jenkins High School |
| GJHS | Glenwood Junior High School |
| GJHS | Gorsebrook Junior High School |
| GJHS | Graham Junior High School |
| GJHS | Grand Junction High School |
| GJHS | Grand JunctionHigh School |
| GJHS | Gray Junior High School |