| Acronym | Definition |
|---|
| MRTA | Movimiento Revolucionario Túpac Amaru (Tupac Amaru Revolutionary Movement, Peru) |
| MRTA | Mortgage Reducing Term Assurance |
| MRTA | Mass Rapid Transit Authority |
| MRTA | Metropolitan Rapid Transit Authority (Bangkok, Thailand) |
| MRTA | Manitoba Recreational Trails Association (Canada) |
| MRTA | Multi Role Transport Aircraft |
| MRTA | Motorcycle Rider Training Association |
| MRTA | Marketable Record Title Act |
| MRTA | Multi-Robot Task Allocation |
| MRTA | Metro Rail Transit Authority |
| MRTA | Montachusett Regional Transit Authority |
| MRTA | Missouri Retired Teachers Association |
| MRTA | Magnetic Resonance Tomographic Angiography |
| MRTA | Maryland Retired Teachers Association |
| MRTA | Medium-Range Tactical Aircraft |
| MRTA | Macedon Ranges Tennis Association (Australia) |
| MRTA | Mediated Real-Time Access |
| MRTA | Malaspina Recreation and Tourism Association (Canada) |
| MRTA | Medical Radiation Technology Act |
| MRTA | Myanmar Rice Traders Association |
| MRTA | Magistrates’ Regional Training Adviser (UK) |
| MRTA | Meaford Range and Training Area (Canadian Forces) |
| MRTA | Marine Repair Technician Association |
| MRTA | Michigan Retired Teachers Association (formerly Michigan Retired Public School Employees Association) |
| MRTA | mechanical resonance tissue analysis |
| MRTA | Maryland Retired Troopers Association |
| MRTA | Modernization Receiver Test Asset |
| MRTA | Mexican Radio and Television Association |
| MRTA | Mississippi Retired Teachers Association |