| ME/C | Medical Examiner and/or Coroner 
| Others |
| MEC | Mack Energy Corp
| Others |
| MEC | Mack Energy Corporation
| Others |
| MEC | MacMillan English Campus
| Others |
| MEC | Macro Expansion Counter
| Others |
| MEC | Main Engine Controller
| Others |
| MEC | Maine Central Railroad
| Others |
| MEC | Maine Central Railroad (later Guilford Transportation Industries, now Pan Am Railways)
| Others |
| MEC | Maine Central Railroad (Pan Am Railways)
| Others |
| MEC | Malawi electoral commission
| Others |
| MEC | Malaysia Electric Corporation
| Others |
| MEC | Management Education for Clinicians
| Others |
| MEC | Management Excellence Community
| Others |
| MEC | Management Executive Committee
| Others |
| MEC | Mantra, Ecuador
| Others |
| MEC | Manufacturing Exploration and Combat
| Others |
| MEC | Manufacturing, Engineering, and Construction
| Others |
| MEC | Many Enemas Coming
| Others |
| MEC | Marginal External Cost
| Others |
| MEC | Marianas Energy Corporation
| Others |
| MEC | Marine Employees Commission
| Others |
| MEC | Massively Empowered Classrooms
| Others |
| MEC | Master Electronic Corporation
| Others |
| MEC | Master Event Collector
| Others |
| MEC | Master Event Controller
| Others |
| MEC | Master Executive Council
| Others |
| MEC | Materials Energy and Constructions
| Others |
| MEC | Materials Experiment Carrier
| Others |
| MEC | Mathematics Education Collaborative
| Others |
| MEC | Matra Enthusiasts Club
| Others |
| MEC | Matter in Extreme Conditions
| Others |
| MEC | Maximus MECCA source file
| Others |
| MEC | Mayville Engineering Co
| Others |
| MEC | Mayville Engineering Company
| Others |
| MEC | Mecaz
| Others |
| MEC | Mechanical Electronics and Computing
| Others |
| MEC | mechlorethamine
| Others |
| MEC | Mecklenburg Electric Cooperative
| Others |
| MEC | meclofenamate
| Others |
| MEC | meconium
| Others |
| MEC | Medgar Evers College
| Others |
| MEC | Media Expansion Card
| Others |
| MEC | Median Effective Concentration
| Others |
| MEC | Medical Education Center
| Others |
| MEC | Medical Education Collaborative
| Others |
| MEC | Medical Electronic Construction
| Others |
| MEC | Medical Eligibility Criteria
| Others |
| MEC | Medical Employment Classification
| Others |
| MEC | Medieval European Coinage
| Others |
| MEC | Mediterranean Exploration Company
| Others |
| MEC | Medium Endurance Cutter
| Others |
| MEC | Member of the Executive Council
| Others |
| MEC | Memory Efficient Convolution
| Others |
| MEC | Mercato Comune Europeo (European Economic Community)
| Others |
| MEC | Merrimack Education Center
| Others |
| MEC | Messerschmitt Enthusiasts Club
| Others |
| MEC | Metalsmith Chief Petty Officer
| Others |
| MEC | Metro Exhibit Corporation
| Others |
| MEC | Metropolitan Educational Council
| Others |
| MEC | Miami Entrepreneurship Center
| Others |
| MEC | Michigan Eclipse Club
| Others |
| MEC | Michigan Environmental Council
| Others |
| MEC | Microbial Electrolysis Cell
| Others |
| MEC | Microsoft Educator Community
| Others |
| MEC | Microsoft Enterprise Cube
| Others |
| MEC | Microsoft Exchange Conference
| Others |
| MEC | Microsoft Experience Center
| Others |
| MEC | Mid Engined Car
| Others |
| MEC | Middle Ear Canal
| Others |
| MEC | Middle East Center
| Others |
| MEC | Middle East Coalition
| Others |
| MEC | Middle East College
| Others |
| MEC | Middle Eastern Cinemas
| Others |
| MEC | Middle European Championship
| Others |
| MEC | Midwest Environmental Control
| Others |
| MEC | Minimal Effective Concentration
| Others |
| MEC | Minimum Effective Concentration
| Others |
| MEC | Minimum Essential Coverage
| Others |
| MEC | Mise En Circulation
| Others |
| MEC | Mission Events Controller
| Others |
| MEC | Mississippi Economic Council
| Others |
| MEC | Mississippi Electronic Courts
| Others |
| MEC | Missouri Equine Council
| Others |
| MEC | Missouri Ethics Commission
| Others |
| MEC | Mitsubishi Eclipse Cross
| Others |
| MEC | Mobile Edge Computing
| Others |
| MEC | Mobile Education Centre
| Others |
| MEC | Mobile Engagement Center
| Others |
| MEC | Mobile Entertainment Center
| Others |
| MEC | Mobile Equipment Console
| Others |
| MEC | Model European Council
| Others |
| MEC | Modeling Experiment and Computation
| Others |
| MEC | Modeling, Experimentation, and Computation
| Others |
| MEC | Modified Endowment Contract
| Others |
| MEC | Modular Energy Carrier
| Others |
| MEC | Mopar Express Care
| Others |
| MEC | Most Efficient Chemistry
| Others |
| MEC | Most Expensive Cars
| Others |
| MEC | Motor Electronics Coolant
| Others |
| MEC | Motor Enthusiasts Club
| Others |
| MEC | Motronic Engine Control
| Others |
| MEC | Mountain East Conference
| Others |
| MEC | Mountain Equipment Co
| Others |
| MEC | Mountain Equipment Co.
| Others |
| MEC | Mountain Equipment Company
| Others |
| MEC | Mountain Equipment Company Vietnam
| Others |
| MEC | Mouse Embryo Cell
| Others |
| MEC | Movimiento Emergent de Concordancia
| Others |
| MEC | mucoepidermoid carcinoma
| Others |
| MEC | Multi-Access Edge Computing
| Others |
| MEC | Multichassis Etherchannel
| Others |
| MEC | Multiple Ethernet Cable
| Others |
| MEC | Mutual Execution of Contract
| Others |