| Acronym | Definition |
|---|
| AEC | Australian Electoral Commission |
| AEC | Architecture, Engineering and Construction |
| AEC | Atomic Energy Commission (superseded by ERDA) |
| AEC | ARS Electronica Center |
| AEC | ASEAN Economic Community |
| AEC | Automatic Exposure Control |
| AEC | Army Environmental Center |
| AEC | African Economic Community |
| AEC | American Eventing Championships |
| AEC | Atomic Energy Council (Taiwan) |
| AEC | Army Environmental Command (US Army; formerly Army Environmental Center) |
| AEC | Art Ensemble of Chicago |
| AEC | Aluminum Extruders Council |
| AEC | Association Executives Council |
| AEC | Academic Enrichment Center (University of Delaware; Newark, DE) |
| AEC | Assessment and Evaluation Commission (Sudan) |
| AEC | Aquitaine Europe Communication (France) |
| AEC | Alberta Energy Company Ltd |
| AEC | Army Evaluation Center (US Army; formerly EAC, Evaluation Analysis Center) |
| AEC | Association Européenne de Coaching (French: European Coaching Association; EU) |
| AEC | Acoustic Echo Control |
| AEC | Advanced Electronics Company |
| AEC | Atomic Energy Committee (Kazakhstan) |
| AEC | All England Club |
| AEC | Area of Environmental Concern |
| AEC | Ankyloblepharon-Ectodermal Defects |
| AEC | Address Element Correction (USPS) |
| AEC | Asian Economic Community |
| AEC | Acoustic Echo Canceler |
| AEC | Army Education Center |
| AEC | Assemblée Européenne des Citoyens (French: Assembly of European Citizens) |
| AEC | Alliant Energy Center (Madison, WI) |
| AEC | Alabama Electric Cooperative, Inc. (Andalusia, AL) |
| AEC | Association of Exhibition Contractors |
| AEC | Avionics Engineering Center |
| AEC | Adaptive Echo Cancellation |
| AEC | Amino Ethyl-Carbazole |
| AEC | Advanced Error Correction (CDS) |
| AEC | Association Européenne des Cheminots (French) |
| AEC | Anglican Episcopal Church |
| AEC | Associate Enforcement Counsels |
| AEC | Automated Electronic Classroom |
| AEC | Army Electronics Command |
| AEC | Automatic Engine Control |
| AEC | Association of Electric Cooperatives |
| AEC | Associated Equipment Company, Ltd |
| AEC | Alternative Energy Coalition |
| AEC | Area Emergency Coordinator |
| AEC | Acoustic Echo Controller |
| AEC | Agency Emergency Coordinator |
| AEC | Aeromedical Evacuation Crew (Air Force Instruction) |
| AEC | Agency of Environmental Conservation |
| AEC | Australian Environmental Council |
| AEC | Automatic Exhaust Control |
| AEC | Chief Aviation Electrician's Mate (Naval Rating) |
| AEC | Acceptable Effluent Concentration |
| AEC | Acoustic Echo Control Equipment |
| AEC | Adult Earnings Change |
| AEC | Agriculture Executive Council |
| AEC | Assessment of Equipment Condition |
| AEC | Analog Electronic Controls |
| AEC | Arithmetic Element Controller |
| AEC | Aegis Education Center |
| AEC | Aft Equipment Compartment |
| AEC | Aquatics Emergency Care (Award, Lifesaving Society of Canada) |
| AEC | Anger Engineering Co. (Milwaukee, WI) |
| AEC | Aerial Experimental Component |
| AEC | Automatic Edge Control |
| AEC | Aviation Electronics Combat |
| AEC | AFSCN Executive Council |
| AEC | Asociación Experimental Cafetalera (Experimental Coffee Association, Guatemala) |
| AEC | Airborne Electronic Combat |
| AEC | Area Equipment Compound |
| AEC | Anno Emmanuelis Christi (Latin; epigraphy) |
| AEC | Allied Environmental Consultants Ltd (Hong Kong) |
| AEC | Alternate Equipment Custodian |
| AEC | Aide aux Enfants Cambodgiens (French: Help for Children in Cambodia) |
| AEC | Anime Enthusiast Club |
| AEC | Automatic Exciter Control |
| AEC | Agent-Environment Coordination |
| AEC | Atlas Educational Center |
| AEC | Anglican Essentials Canada, Inc (Milton, ON, Canada) |
| AEC | Asian European Council (est. 1994) |
| AEC | Able Enrichment Centre (Winnipeg, Manitoba, Canada) |
| AEC | Advanced Environmental Corporation |
| AEC | Association Européenne de Cyclosport (French: European Cyclosport Association) |
| AEC | Animal Emergency Clinic (various locations) |
| AEC | Advanced Energy Conversion (Schenectady, NY) |
| AEC | Accounting Education Center (American Institute of Certified Public Accountants) |
| AEC | Alliance Entertainment Corporation (various locations) |
| AEC | Alaskan Engineering Commission (1914-1923) |
| AEC | Alumni Executive Committee (various schools) |
| AEC | Automatic Error Correction |
| AEC | Atelier d'Etudes Climatiques (French: Climate Studies Workshop) |
| AEC | Annual Education Conference (various organizations) |
| AEC | Association des Economistes Catholiques (French: Catholic Economists Association) |