| MEI | Magna Exteriors and Interiors 
| Others |
| MEI | Magnetic Electron Induction
| Others |
| MEI | Maintenance des Equipements Industriels
| Others |
| MEI | Manageability Engine Interface
| Others |
| MEI | Managing Editor, Inc.
| Others |
| MEI | Mars Electronics, Incorporated
| Others |
| MEI | Master Inspection Item
| Others |
| MEI | Material Evidence in Incunabula
| Others |
| MEI | Mathematical Expression Interpreter
| Others |
| MEI | Mathematics in Education and Industry
| Others |
| MEI | Matsushita Electronics, Incorporated
| Others |
| MEI | Maximum Exposed Individual
| Others |
| MEI | McMillan Enterprises, Inc.
| Others |
| MEI | Media Engagement Index
| Others |
| MEI | Medical Education Institute
| Others |
| MEI | Medicare Economic Index
| Others |
| MEI | Menominee Enterprises, Inc.
| Others |
| MEI | Meridian, Mississippi USA
| Others |
| MEI | Message Express Internet
| Others |
| MEI | Metaphase Enovia Integration
| Others |
| MEI | Methode Electronics Inc
| Others |
| MEI | Micro Electronics International
| Others |
| MEI | Middle East Institute
| Others |
| MEI | Midwest Economy Index
| Others |
| MEI | Minerals Engineering International
| Others |
| MEI | Missouri Energy Initiative
| Others |
| MEI | Modified Embedded Invalid
| Others |
| MEI | Modified Embedded Invalidb
| Others |
| MEI | Modified Exclusive And Invalid
| Others |
| MEI | Modified, Exclusive, And Invalid
| Others |
| MEI | Molkenbuhr Enterprises, Inc.
| Others |
| MEI | Morgan Electric Inc
| Others |
| MEI | Morocco Electric Inc
| Others |
| MEI | Mountain Equipment Inc
| Others |
| MEI | Multi-Engine Instructor
| Others |
| MEI | Multicultural Entrepreneurial Institute
| Others |
| MEI | Multiprotocol Encapsulation Implementation
| Others |
| MEI | Multivariate ENSO Index
| Others |
| MEI | Municipal Equality Index
| Others |
| MEI | Music Encoding Initiative
| Others |
| MEI | Musical Encoding Initiative
| Others |
| MEI | My Employment Information
| Others |