| Abbreviation | Definition |
|---|---|
| GMMS | Grand Mesa Middle School |
| GMMS | Great Meadows Middle School |
| GMMS | Green Mountain Massage School |
| GMNS | Grace Methodist Nursery School |
| GMS | Gallagher Middle School |
| GMS | Galvez Middle School, Galvez, Louisiana |
| GMS | Gambetta Middle School |
| GMS | Gardner Middle School |
| GMS | Gilford Middle School |
| GMS | Glennville Middle School |
| GMS | Glenwood Middle School |
| GMS | Goochland Middle School |
| GMS | Gorzycki Middle School |
| GMS | Grant Maintained School |
| GMS | Grapevine Middle School |
| GMS | Grassland Middle School |
| GMS | Greeneville Middle School |
| GMS | Greenwood Middle School |
| GMS | Gregg Middle School |
| GMS | Griffin Memorial School |