AEI

AEI may refer to:

• Adelaide Educational Institution of South Australia
• Aei Latin-script trigraph
• AEI Music Network Inc. (Audio Environments Incorporated), which created the "Foreground Music" industry in 1971
• Albert Einstein Institute, the Max Planck Institute for Gravitational Physics, Germany
• Albert Einstein Institution, an organisation involved in non-violent methods of political resistance based in the US
• Alliance for European Integration, the ruling coalition in Moldova since the July 2009 election
• American Enterprise Institute, a conservative think tank
• Architectural Engineering Institute
• Archive of European Integration
• Associated Electrical Industries, large company in the UK (now defunct)
• Automatic Equipment Identification, as used by the railroad industry
• Average Earnings Index, British labour market measure
• Average Earnings Index (horse racing), American horse racing measure
• Atomic Energy Organization
• State Research Agency, a Spanish state agency responsible for the promotion of scientific and technical research