| Acronym | Definition |
|---|
| ACA | American Chiropractic Association |
| ACA | American Correctional Association |
| ACA | American Camp Association |
| ACA | Arms Control Association |
| ACA | American Counseling Association |
| ACA | American Camping Association |
| ACA | American Canoe Association |
| ACA | American Cable Association |
| ACA | American Culture Association |
| ACA | Amputee Coalition of America |
| ACA | A Current Affair |
| ACA | Australian Communications Authority |
| ACA | Air Canada (ICAO code) |
| ACA | American Cycling Association |
| ACA | American Crystallographic Association |
| ACA | Atheist Community of Austin |
| ACA | Adult Children of Alcoholics |
| ACA | Adventure Cycling Association (Missoula, Montana) |
| ACA | Anti-Corruption Agency (Malaysia) |
| ACA | Annual Catholic Appeal |
| ACA | Association of Canadian Archivists |
| ACA | Anterior Cerebral Artery |
| ACA | Academic Cooperation Association (Belgium) |
| ACA | Application Control Architecture (DEC) |
| ACA | American Composers Alliance |
| ACA | Alley Cat Allies |
| ACA | Australian Consumers' Association |
| ACA | Automóvil Club Argentino |
| ACA | Atlantic Coast Airlines |
| ACA | American Collectors Association |
| ACA | Army Contracting Agency |
| ACA | Appalachian College Association |
| ACA | Applications of Computer Algebra |
| ACA | Australian Cricketers' Association |
| ACA | American Communication Association |
| ACA | Asociación Cristiana (Christian Association, Guatemala) |
| ACA | Association of Consulting Actuaries |
| ACA | Australian Coal Association |
| ACA | American Council on Alcoholism |
| ACA | American Cornhole Association |
| ACA | Anglican Church in America |
| ACA | Australian Centre for Astrobiology |
| ACA | Additional Central Assistance |
| ACA | Acción Católica Argentina (Spanish) |
| ACA | American Civic Association |
| ACA | Anticardiolipin Antibody |
| ACA | Agricultural Credit Association |
| ACA | American Compensation Association |
| ACA | Anisotropic Conductive Adhesive (fine-pitch chip-on-flex packages for LCD applications) |
| ACA | Ammoniacal Copper Arsenate (wood preservative) |
| ACA | Airspace Control Authority |
| ACA | Academic Building |
| ACA | Academy of Certified Archivists |
| ACA | Aircraft Carrier Alliance |
| ACA | Agriculture Council of America |
| ACA | Air Care Alliance |
| ACA | Amazon Conservation Association (Washington, DC) |
| ACA | Avis de Changement d'Adresse (Canada Post) |
| ACA | Association of Chartered Accountants |
| ACA | Australian Counselling Association (Grange, QLD, Australia) |
| ACA | Adult Children Anonymous |
| ACA | American Cichlid Association |
| ACA | Akita Club of America |
| ACA | American Cryptogram Association |
| ACA | American Country Award (music) |
| ACA | Author Co-Citation Analysis |
| ACA | Associate of the Institute of Chartered Accountants |
| ACA | Allied Cash Advance |
| ACA | Automóbil Club d'Andorra (Catalan: Automobile Club of Andorra) |
| ACA | After Contract Award |
| ACA | Alberta Construction Association |
| ACA | Aluminum Company of America |
| ACA | American Chain Association |
| ACA | Asociación Campesina de Arauca (Spanish: Arauca Peasants Association; Arauca, Colombia) |
| ACA | Airspace Coordination Area |
| ACA | Association of Consulting Architects |
| ACA | Alaska Conservation Alliance |
| ACA | Application Continuity Appliance (Teneros) |
| ACA | Agence Culturelle d'Alsace (French: Alsace Cultural Agency) |
| ACA | Avanade Connected Architecture (Avanade Inc.) |
| ACA | Association for Communication Administration |
| ACA | Arizona Contractors Association |
| ACA | Administrative Cost Allowance (student financial aid) |
| ACA | Air Commando Association |
| ACA | Adaptive Channel Allocation |
| ACA | American Cadet Alliance |
| ACA | Alabama Cattlemen's Association |
| ACA | Air Courier Association |
| ACA | Associate Contractor Agreement |
| ACA | Administrative Control Authority |
| ACA | Agricultural Credit Act of 1987 |
| ACA | Aircrew Association (UK) |
| ACA | Australian Coastal Atlas |
| ACA | Awassa College of Agriculture (Ethiopia) |
| ACA | Agency for Cultural Affairs (Japan; est. 1968) |
| ACA | American Conservation Association |
| ACA | American Cuemakers Association |
| ACA | Association of Chinese Americans |
| ACA | Austrian Consultants Association (Austria) |
| ACA | Association for the Calligraphic Arts |
| ACA | Astronomie Centre Ardenne (French astronomy club) |
| ACA | Air Clearance Authority |
| ACA | Acapulco, Guerrero, Mexico - Alvarez International (Airport Code) |
| ACA | Automatic Circuit Assurance |
| ACA | Asynchronous Communications Adapter |
| ACA | Allegheny Cycling Association |
| ACA | All Channel Alert (Canada) |
| ACA | Architectural Cladding Association (UK) |
| ACA | Antarctic Conservation Act |
| ACA | Airlift Clearance Authority |
| ACA | American Creativity Academy (Kuwait) |
| ACA | Allan Crawford Associates (Canada) |
| ACA | Association for Community Advocacy |
| ACA | Allocation Chômeur Âgé |
| ACA | Animal Charities of America |
| ACA | Alzheimer's of Central Alabama |
| ACA | Astronautics Corporation of America |
| ACA | American Canine Association, Inc. |
| ACA | Average Case Analysis |
| ACA | Advanced Combat Aircraft |
| ACA | Association Canadienne d'Acoustique (Canadian Acoustical Association) |
| ACA | Abduction Central Alert |
| ACA | Athlétic Club Arles-Avignon (French football club) |
| ACA | American Countertrade Association |
| ACA | American Catahoula Association |
| ACA | Australian Clogging Association |
| ACA | Advanced Cargo Aircraft |
| ACA | American Cheerleaders Association |
| ACA | Access Control Agent |
| ACA | Adjacent-Channel Attenuation |
| ACA | Attitude Control Assembly |
| ACA | American Coach Association |
| ACA | Avoids Cascading Aborts |
| ACA | Alberta Chess Association |
| ACA | Adviser Compliance Associates, LLC |
| ACA | Arizona Cultural Academy (Phoenix, AZ) |
| ACA | Alliance of Cambridge Advisors |
| ACA | Archbishop's Catholic Appeal |
| ACA | Alerting Communicators of America |
| ACA | Alternate Command Authority |
| ACA | Arizona Counselors Association |
| ACA | Absolute Calibration Audit |
| ACA | Adaptive Component Architecture |
| ACA | Animal Care Attendant (veterinary) |
| ACA | Associate of the Conference of Consulting Actuaries |
| ACA | Agri Coll Association (French agricultural toy association) |
| ACA | Amphibian Conservation Alliance |
| ACA | American Chess Association |
| ACA | Arts and Cultural Alliance |
| ACA | American Craft Association |
| ACA | Action Culturelle et Artistique (French: Artistic and Cultural Action; University of Paris VIII; France) |
| ACA | A36-A350 Corridor Alliance |
| ACA | Automobile Club d'Aix (French automobile club) |
| ACA | Artisan Contractors Association of America |
| ACA | Aero Club Albatross (Delaware, NJ) |
| ACA | Academy for Culinary Arts |
| ACA | Air Control Authority |
| ACA | Applied Combinatorial Analysis |
| ACA | Asynchronous Criticality Avoidance |
| ACA | Allo Casse Auto (French automobile parts company) |
| ACA | Adaptive Configuration Agent |
| ACA | Australian Croquet Association Inc |
| ACA | Aéro-Club d'Abidjan (French; flying club; Ivory Coast) |
| ACA | Ambo College of Agriculture (Ethiopia) |
| ACA | American Carbohydrate Association |
| ACA | Asociación Casa Alianza (Marriage Alliance Association, Guatemala) |
| ACA | Assignment Control Authority |
| ACA | Anniston Chemical Activity (Anniston, Alabama) |
| ACA | Advertising Council of America |
| ACA | All Composite Aircraft |
| ACA | Acquisition Capability Assessment |
| ACA | Autonomous Cooperating Agent |
| ACA | Application Control Account |
| ACA | Auditeurs et Consultants Africains (French: African Auditors and Consultants) |
| ACA | American Cuesports Alliance |
| ACA | Automatic Circuit Analyzer |
| ACA | Automatic Conference Arranger |
| ACA | Asynchronous Cooperative Algorithm |
| ACA | Average Coherence Approximation |
| ACA | American Cheerleading Academy |
| ACA | Aquadev Central Africa |
| ACA | Aviation Club d'Avord (French poker club) |
| ACA | Alpine Côte d'Azur (French automobile club) |
| ACA | Agricultural Credits Act of 1928 |
| ACA | Amusement Corporation of America (carnivals and fairs) |
| ACA | Automated Circuit Assurance |
| ACA | Analysis of Collection Activity |
| ACA | Airborne Collection Assembly |
| ACA | Active Circulator Antenna |
| ACA | Autobody Craftsmans Association |
| ACA | Advanced Confidentiality Agreement |
| ACA | Autoclub Altena (Dutch; Belgian car club) |
| ACA | All Call Answered (Sprint) |
| ACA | Automatic Conference Arrangement |
| ACA | Auto-Configuration Agent |
| ACA | Advisory Committee on Aero-ballistics |
| ACA | Adaptive Computing Architecture |
| ACA | Automatic Contrast Adjustment |
| ACA | Advanced Commercial Airliner |
| ACA | Advanced Contract Administrator |
| ACA | Association Chalonnaise d'Aquariophilie (French; aquarium enthusiasts' association) |
| ACA | Agent of the Certifying Authority (performs certification testing of systems) |
| ACA | Australian Citizenship Act |
| ACA | American Contemporary Art |
| ACA | Adobe Certified Associate |
| ACA | American Citizens Abroad (various locations) |
| ACA | Angel Capital Association (trade association) |
| ACA | Atlantic Center for the Arts (New Smyrna Beach, FL) |
| ACA | Advisory Commission on Aging (Alameda, CA) |
| ACA | Armed Criminal Action |
| ACA | Affordable Care Act of 2010 |
| ACA | Anterior Communicating Artery (blood vessel) |
| ACA | Assistant City Attorney |