| GISD | Gadsden Independent School District 
| Others |
| GISD | Gainesville Independent School District
| Others |
| GISD | Galveston Independent School District
| Others |
| GISD | Garland Independent School District
| Others |
| GISD | Garland ISD
| Others |
| GISD | Gatesville Independent School District
| Others |
| GISD | Genesee Intermediate School District
| Others |
| GISD | Geographic Information for Sustainable Development
| Others |
| GISD | Georgetown Independent School District
| Others |
| GISD | Girls In Sports Day
| Others |
| GISD | Gladewater Independent School District
| Others |
| GISD | Global Invasive Species Database
| Others |
| GISD | Global Investors for Sustainable Development
| Others |
| GISD | Goliad Independent School District
| Others |
| GISD | Gonzales Independent School District
| Others |
| GISD | Graduate Interdisciplinary Specialization in Demography
| Others |
| GISD | Greenville Independent School District
| Others |