| MCTA | Mahoning and Columbiana Training Association 
| Others |
| MCTA | Maine Christmas Tree Association
| Others |
| MCTA | Mandalay Chan Thar Academy
| Others |
| MCTA | Manufacturing and Construction Technology Academy
| Others |
| MCTA | Maryland Christmas Tree Association
| Others |
| MCTA | Maryland College Testing Association
| Others |
| MCTA | Maryland Combined Training Association
| Others |
| MCTA | Michigan Cable Telecommunications Association
| Others |
| MCTA | Michigan Christmas Tree Association
| Others |
| MCTA | Midwest Chinese Teachers' Alliance
| Others |
| MCTA | Minal Computer Training Academy
| Others |
| MCTA | Minimal Contour Tracking Algorithm
| Others |
| MCTA | Minnesota Central Railroad
| Others |
| MCTA | Minnesota Central Railroad Company
| Others |
| MCTA | Mississippi Cable Telecommunications Association
| Others |
| MCTA | Mississippi Combat Training Academy
| Others |
| MCTA | Mississippi Communications Technology Alliance
| Others |
| MCTA | Missouri Cable Telecommunications Association
| Others |
| MCTA | Monroe County Taxpayers Association
| Others |
| MCTA | Monroe County Transit Authority
| Others |
| MCTA | Montgomery County Tennis Association
| Others |
| MCTA | Motor Carriers Traffic Association
| Others |
| MCTA | Motor City Tennis Alliance
| Others |
| MCTA | Multi-Carrier Traffic Allocation
| Others |
| MCTA | Murray Calloway Transit Authority
| Others |