GAST
| Acronym | Definition |
|---|---|
| GAST | GnRH (Gonadotropin-Releasing Hormone) Agonist Stimulation Test |
| GAST | Greenwich Apparent Sidereal Time |
| GAST | Gemeinschaft Autofreier Schweizer Tourismusorte (German: Community of Car-Free Swiss Resorts) |
| GAST | German-American Society of Tulsa (Tulsa, OK) |
| GAST | Ghana Association of Science Teachers (est. 1955; Ghana) |
| GAST | Generic Automatic Software Test |
| GAST | GBAS (Ground Based Augmentation System) Approach Service Type (aircraft) |