MEA

• Maine Educational Assessment, a standardized test which was phased out for high school juniors in favor of the SAT
• Manx Electricity Authority
• Materials and Equipment Acceptance, an agency that examines and provides approval for certain manufactured equipment for use in New York City.
• Membrane Electrode Assembly, part of a PEM fuel cell
• Mercaptoethylamine-2, an organic chemical compound
• Michigan Education Association
• Middle East Airlines, flag carrier of Lebanon
• The Middle East Association, a business organization
• Middle East & Africa Region of Little League World Series in baseball
• Middle East and Asia
• Millennium Ecosystem Assessment
• Minimum Enroute Altitude, the recommended minimum altitude for a segment of an airway
• Ministry of External Affairs
• Minnesota Education Association
• Mobile Electronics Australia
• Monoethanolamine, an organic chemical compound
• Multielectrode array or multi-electrode array to record activity from populations of neurons
• Multilateral Environmental Agreement
• Museum of European Art

People

• Mea, Ivan Della (1940-2009), Italian singer

Fictional characters

• Mea, a maid for three sisters in the anime & eroge game Popotan