| Acronym | Definition |
|---|
| GMCA➣Great March for Climate Action (est. 2013) |
| GMCA➣Greater Manchester Combined Authority (Manchester, England, UK) |
| GMCA➣Galt Mile Community Association (Fort Lauderdale, FL) |
| GMCA➣Global Marketing Communication & Advertising (academic program) |
| GMCA➣Georgia Mosquito Control Association (Statesboro, GA) |
| GMCA➣Global Marine Climatic Atlas |
| GMCA➣Georgia Municipal Cemetery Association |
| GMCA➣Gore Microwave Cable Assembly |