| MC&G | Mapping, Charting, and Geodesy 
| Others |
| McG | Joseph McGinty Nichol
| Others |
| MCG | Magnetocardiography
| Others |
| MCG | Mahaska Communication Group
| Others |
| MCG | Mahinda College Galle
| Others |
| MCG | Main Crop Group
| Others |
| MCG | Make Cars Green
| Others |
| MCG | Management Compensation Group
| Others |
| MCG | Management Consulting Group
| Others |
| MCG | Manchester Craftsman Guild
| Others |
| MCG | Manchester Craftsmen's Guild
| Others |
| MCG | Mapping Class Group
| Others |
| MCG | Max Creation Graph
| Others |
| MCG | Maximum Capital Gains
| Others |
| MCG | McGrath Airport
| Others |
| MCG | McGrath City Airport, McGrath, Alaska USA
| Others |
| MCG | McGregor station
| Others |
| MCG | McKinsey Center for Government
| Others |
| MCG | Media Corba Gateway
| Others |
| MCG | Medical College of Georgia
| Others |
| MCG | Mediocre Crowd Gathering
| Others |
| MCG | Medium Caliber Gun
| Others |
| MCG | Melbourne country ground
| Others |
| MCG | Melbourne Cricket Ground
| Others |
| MCG | Mendip Caving Group
| Others |
| MCG | Mercedes Car Group
| Others |
| MCG | Mercer Consulting Group
| Others |
| MCG | Meta Certificate Group
| Others |
| MCG | Meta-Certificate Group
| Others |
| MCG | Michael Cohen Group
| Others |
| MCG | Microcomputer Consulting Group
| Others |
| mcg | Microgram
| Others |
| MCG | Mid Continent Group
| Others |
| MCG | Midwest Consulting Group
| Others |
| MCG | Miethner Creative Group
| Others |
| MCG | Milliman Care Guidelines
| Others |
| MCG | Mobile Cloud Gaming
| Others |
| MCG | Model Chain Graphic
| Others |
| MCG | Montgomery Coscia Greilich
| Others |
| MCG | Moonlight Chat Galaxy
| Others |
| MCG | Morphological Catalogue of Galaxies
| Others |
| MCG | Mortgage
| Others |
| MCG | Motor City Garage
| Others |
| MCG | Mouvement Citoyens Genevois
| Others |
| MCG | Movimiento Comunista de Galicia
| Others |
| MCG | Movimiento Cooperativista Guatemalteco
| Others |
| MCG | Multi Color Graphic
| Others |
| MCG | Multifunction CardioGram
| Others |
| MCG | Multiple Coalition Game
| Others |
| MCG | Multiscale Combinatorial Grouping
| Others |
| MCG | Municipal Corporation of Gurgaon
| Others |
| MCG | Municipal Corporation of Gurugram
| Others |
| MCG | Museums Computer Group
| Others |
| MCG | Muslim Consumer Group
| Others |
| MCG | My Classic Garage
| Others |
| MCG | Mycelial Compatibility Group
| Others |