MEI

MEI may refer to:

Education

 * MEI Academy, an international school
 * Mathematics in Education and Industry, an examination board affiliated with the OCR examination board
 * Mennonite Educational Institute, an independent grades K-12 school in Abbotsford, British Columbia

Businesses

 * MEI (company), manufacturer of cash handling systems
 * Matsushita Electric Industrial Co., Ltd.
 * Micro Electronics, Inc.
 * Member of the Energy Institute (MEI)
 * Meeting delle etichette indipendenti, an annual conference of Italian independent record labels

Government

 * Ministry of Economy and Innovation (Ministério da Economia e Inovação), the Portuguese economy ministry
 * Middle East Institute
 * Marginal efficiency of investment or internal rate of return, a relationship between interest rate and amount of investment that can be profitable at a given time
 * Meridian Regional Airport
 * Montreal Economic Institute
 * Meridian (Amtrak station), Amtrak station code MEI, Mississippi, United States
 * Medicare Economic Index

Military

 * MEI Hellhound (Grenade), low velocity multipurpose grenade
 * MEI Mercury, a family of grenades developed by Martin Electronics, Inc.

Science

 * Iodomethane (methyl iodide, MeI), a halomethane
 * Multivariate ENSO index
 * 4-Methylimidazole (4-MEI), a chemical compound

Technology

 * Management Engine Interface, a component of Intel Active Management Technology
 * Music Encoding Initiative, a music encoding format

Other uses

 * Media and Entertainment International, a former global union federation
 * OECD Main Economic Indicators, a monthly publication of the Organisation for Economic Co-operation and Development