| Acronym | Definition |
|---|
| GTMM➣Globetrotter Mobility Manager (software) |
| GTMM➣General Transfer Matrix Method |
| GTMM➣Geotechnical Measurements and Modelling (conference) |
| GTMM➣General Training for Mustofiats Managers |
| GTMM➣Ghadir Textile Machinery Mfg. (Iran) |
| GTMM➣Grupo de Trabalho Misto de Meteorologia (Portuguese: Joint Working Group on Meteorology) |
| GTMM➣Groupware-Based Topic Map Modeler (software) |
| GTMM➣Global Terrestrial Mercury Model (geoscience) |