| MRTA | Malaspina Recreation and Tourism Association (Canada) | 马拉斯皮纳娱乐和旅游协会（加拿大） |
| MRTA | Macedon Ranges Tennis Association (Australia) | 马其顿山脉网球协会（澳大利亚） |
| MRTA | Manitoba Recreational Trails Association (Canada) | 马尼托巴省休闲步道协会（加拿大） |
| MRTA | Michigan Retired Teachers Association (formerly Michigan Retired Public School Employees Association) | 密歇根州退休教师协会（原密歇根州退休公立学校员工协会） |
| MRTA | Marine Repair Technician Association | 海事维修技师协会 |
| MRTA | Mississippi Retired Teachers Association | 密西西比州退休教师协会 |
| MRTA | Myanmar Rice Traders Association | 缅甸大米贸易商协会 |
| MRTA | Motorcycle Rider Training Association | 摩托车驾驶员培训协会 |
| MRTA | Mexican Radio and Television Association | 墨西哥广播电视协会 |
| MRTA | Maryland Retired Teachers Association | 马里兰州退休教师协会 |
| MRTA | Missouri Retired Teachers Association | 密苏里州退休教师协会 |
| MRTA | Maryland Retired Troopers Association | 马里兰州退役军人协会 |
| MRTA | Movimiento Revolucionario TÚpac Amaru | Movimiento Revolucionario TÚpac Amaru |
| MRTA | Metro Rail Transit Authority | 地铁轨道交通管理局 |
| MRTA | Montachusett Regional Transit Authority | 蒙塔丘塞特地区运输局 |
| MRTA | Movimiento Revolucionario TÚpac Amaru (Tupac Amaru Revolutionary Movement, Peru) | Movimiento Revolucionario TÚpac Amaru (Tupac Amaru Revolutionary Movement, Peru) |
| MRTA | Medium-Range Tactical Aircraft | 中程战术飞机 |
| MRTA | Modernization Receiver Test Asset | 现代化接收机测试资产 |
| MRTA | Multi Role Transport Aircraft | 多功能运输机 |
| MRTA | Magnetic Resonance Tomographic Angiography | 磁共振断层扫描血管造影 |
| MRTA | Mediated Real-Time Access | 中介实时访问 |
| MRTA | Medical Radiation Technology Act | 《医疗辐射技术法》 |
| MRTA | mechanical resonance tissue analysis | 机械共振组织分析 |
| MRTA | Marketable Record Title Act | 《可销售记录所有权法案》 |
| MRTA | Multi-Robot Task Allocation | 多机器人任务分配 |
| MRTA | Meaford Range and Training Area (Canadian Forces) | Meaford靶场和训练区（加拿大部队） |
| MRTA | Metropolitan Rapid Transit Authority (Bangkok, Thailand) | 大都会快速交通管理局（泰国曼谷） |
| MRTA | Mortgage Reducing Term Assurance | 减少抵押贷款期限的保证 |
| MRTA | Mass Rapid Transit Authority | 大众捷运局 |