| M/CM/S | Mobility, Countermobility, and/or Survivability 
| Others |
| MCMS | Machinery Control and Monitoring System
| Others |
| MCMS | Madison Co Middle School
| Others |
| MCMS | Madison Community Montessori School
| Others |
| MCMS | Madison County Medical Society
| Others |
| MCMS | Madison County Middle School
| Others |
| MCMS | Maine Chamber Music Seminar
| Others |
| MCMS | Manchester Community Music School
| Others |
| MCMS | Maranacook Community Middle School
| Others |
| MCMS | Marengo Community Middle School
| Others |
| MCMS | Maricopa County Medical Society
| Others |
| MCMS | Mason County Middle School
| Others |
| MCMS | Mass Communications and Media Studies
| Others |
| MCMS | McIntosh County Middle School
| Others |
| MCMS | Medea Creek Middle School
| Others |
| MCMS | Meridian Creek Middle School
| Others |
| MCMS | Metbench Calibration Management System
| Others |
| MCMS | Microsoft Content Management Server
| Others |
| MCMS | Mill Creek Middle School
| Others |
| MCMS | Miller Creek Middle School
| Others |
| MCMS | Missouri City Middle School
| Others |
| MCMS | Mobile Collaboration Management Service
| Others |
| MCMS | Mobile Content Management System
| Others |
| MCMS | Monroe County Medical Society
| Others |
| MCMS | Monroe County Middle School
| Others |
| MCMS | Montgomery Central Middle School
| Others |
| MCMS | Montgomery County Medical Society
| Others |
| MCMS | Montgomery County Middle School
| Others |
| MCMS | Montrose Christian Montessori School
| Others |
| MCMS | Morehead City Middle School
| Others |
| MCMS | Morgan County Middle School
| Others |
| MCMS | Mossy Creek Middle School
| Others |
| MCMS | Mt Carmel Middle School
| Others |