| Acronym | Definition |
|---|
| GTMA | Greater Toronto Marketing Alliance (Canada) |
| GTMA | Gauge and Toolmakers Association (UK) |
| GTMA | Great Minds Think Alike |
| GTMA | Getting the Message Across (UK communications firm) |
| GTMA | German Trademark Act |
| GTMA | Grid Trade Master Agreement |
| GTMA | Georgia Textile Manufacturers Association |
| GTMA | Gauteng Transport Management Authority (South Africa) |
| GTMA | Garment and Textile Manufacturers Association (Malawi) |
| GTMA | Georgia Transfer to Minors Act |
| GTMA | Green Throated Mango A (A. viridigula) |
| GTMA | Gas Turbine Materials Associates, Inc. |
| GTMA | Glendale Transportation Management Association (California) |