| Acronym | Definition |
|---|
| MEI | Ministry of European Integration (various locations) |
| MEI | Minerals Engineering International (UK) |
| MEI | Meeting Etichette Indipendenti (Italian: Meeting of Independent Labels) |
| MEI | Maximum Exposed Individual |
| MEI | Middle East Institute |
| MEI | Multiprotocol Encapsulation Implementation |
| MEI | Micro Electronics, Inc. (various locations) |
| MEI | Medicare Economic Index |
| MEI | Main Economic Indicators |
| MEI | Ministry of Energy and Infrastructure (Ontario, Canada) |
| MEI | Middle East International |
| MEI | Midwest Economy Index (nonfarm business activity) |
| MEI | Multi Engine Instructor |
| MEI | Maryland English Institute |
| MEI | Montreal Economic Institute (Canada) |
| MEI | Mathematics in Education and Industry (UK syllabus organisation) |
| MEI | Mennonite Educational Institute (Canada) |
| MEI | Medical Examiner Investigator |
| MEI | Monthly Economic Indicators |
| MEI | Medium Energy Ion |
| MEI | Municipal and Environmental Infrastructure (EU) |
| MEI | Measured Equation of Invariance |
| MEI | Muniz Engineering Inc. (multiple locations) |
| MEI | Master of Electronic Imaging |
| MEI | Most Exposed Individual (risk assessment) |
| MEI | Mosaica Education, Inc. (alternative education) |
| MEI | Molecular Electronic Transducer |
| MEI | Meridian, MS, USA - Key Field (Airport Code) |
| MEI | Measuring Eco-Innovation (Netherlands) |
| MEI | Management Effectiveness Inspection |
| MEI | Ministry of Electronic Industry (various nations) |
| MEI | Multilateral Economic Institutions |
| MEI | Maize Equivalent Income (Africa) |
| MEI | Mountain Enterprises and Infrastructure |
| MEI | Mandatory Expanded Inspection (Port State Control) |
| MEI | Mysore Electrical Industries |
| MEI | Maintenance Engineering Inspection |
| MEI | Missile ECM Improvement |
| MEI | Miller Electric Incorporated |
| MEI | Manual of Engineering Instructions |
| MEI | Multivariate ENSO Indicator |
| MEI | Maritime Education Initiative |
| MEI | Major End Item |
| MEI | Multiple Extension In Use |
| MEI | Maguire Energy Institute |
| MEI | Multiple Extension Internetworking |
| MEI | Message Exchange Interface |
| MEI | Manufacturing Engineering Instructions |
| MEI | Manual Electrical Isolation (drilling) |
| MEI | Maintenance Enterprise Inc (Yonkers, NY) |