| MCAR | Maine Commercial Association of REALTORS 
| Others |
| MCAR | Malaysian Civil Aviation Regulation
| Others |
| MCAR | Medium Caliber Assault Rifle
| Others |
| MCAR | Middlesex County Association of REALTORS
| Others |
| MCAR | Military Construction Army Reserve
| Others |
| MCAR | Military Construction, Army Reserve
| Others |
| MCAR | Missing Completely At Random
| Others |
| MCAR | Mitchell County Animal Rescue
| Others |
| MCAR | Model Civil Aviation Regulations
| Others |
| MCAR | Monmouth County Association of REALTORS
| Others |
| MCAR | Monroe County Association of Realtors
| Others |
| MCAR | Monterey County Association of REALTORS
| Others |
| MCAR | Montgomery County Association of Realtors
| Others |
| MCAR | Most Complex Applicable Rule
| Others |