AEC may refer to:
Organizations
- Catalan Space Agency (Agència Espacial de Catalunya)
- Ars Electronica Center, Linz, Austria
- Art Ensemble of Chicago, US
Governance
- African Economic Community
- Alaska Engineering Commission
- ASEAN Economic Community
- Assessment and Evaluation Commission, a peace agreement monitoring commission in Sudan
- Assets Examination Committee, a military-appointed committee in Thailand
- Atomic Energy Commission (disambiguation), of various countries, especially:
- Australian Electoral Commission
Business
- Aero Engine Controls, a Rolls-Royce plc company
- AEC (Alashki Engineering Constructions), Bulgarian structural and civil engineering company
- Aluminum Extruders Council, a US trade association
- Anger Engineering Company, in Milwaukee, Wisconsin, US, from 1913 to 1915
- Architecture, Engineering, & Construction, a collective term for 3 associated industries
- Associated Equipment Company, a former British bus and lorry manufacturer
- Astro AEC, a Malaysia TV channel
- Automotive Electronics Council, a US qualification standard organization
- Advanced Electronics Company, Riyadh, Saudi Arabia
Education
- Army Educational Corps, later the Royal Army Educational Corps
- Asansol Engineering College, in West Bengal, India
- Assam Engineering College, in Guwahati city, India
- European Association of Conservatoires, the main association of colleges and university schools of music in Europe
Science and technology
- 3-amino-9-ethylcarbazole, an immunohistochemistry stain (chromogen)
- Abstract elementary class, in mathematical logic
- Acoustic echo cancellation, in telephony
- Automatic exposure control, in radiography
Sports
- America East Conference, an NCAA Division I athletic conference
- Atlantic East Conference, an NCAA Division III athletic conference
Other uses
- AEC Armoured Command Vehicle, a series of command vehicles built by the British Associated Equipment Company during the Second World War .
- Anti-Eviction Campaign, a South African social movement
- Sa'idi Arabic (ISO 639-3 code)
- Attestation of College Studies, a college certificate in the Quebec, Canada
- Architecture, engineering and construction, an industry; for example see Industry Foundation Classes
- Actually existing capitalism
- Acoustic Echo Cancellation