| Atlantic Coastal Action Program | Academic & Science |
| Accounting Career Awareness Program | Accounts and Finance |
| Academic and Career Achievement | Business |
| Academy of Clinical and Applied Psychoanalysis | Business |
| As Close As Possible | Business |
| Associate Certified Analytics Professional | Business |
| Association of Croatian American Professionals | Community |
| Association of Consumer Affairs Professionals | Community |
| Association of Chinese American Physicans | Community |
| Atlanta Christian Apologetics Project | Community |
| Adventist Composers, Arrangers, and Poets | Community |
| Alberta Coalition Against Poverty | Community |
| Accounting Careers Awareness Program | Community |
| Arab Center for Alternative Planning | Community |
| Aboriginal Cultural Awareness Program | Community |
| Associazione Cabotaggio Armatori Partenopei | Community |
| Adult Community Autism Program | Community |
| Association for Community Affiliated Plans | Community |
| Adirondack Community Action Programs | Community |
| Autistic Community Activity Program | Community |
| Association of Chinese American Physicians | Community |
| Albany Community Action Partnership | Community |
| Accelerated Culinary Arts Program | Community |
| Agreement on the Conservation of Albatrosses and Petrels | Community |
| Association of Chinese American Professionals | Community |
| Adaptive Community Approach Program | Community |
| Atlanta Canine Adoption Project | Community |
| Association of Community Action Partnerships | Community |
| Advanced Common Application Platform | Computer Hardware |
| Advanced Computer Airframe Program | Computing |
| Application Control Access Protocol | Computing |
| Association of College Administration Professionals | Educational Institute |
| Australian College of Applied Psychology | Educational Institute |
| Aged Care Assessment Program | General |
| Airport Capital Assistance Program | General |
| Automated Collections Action Program | General |
| Advance Credit Administration Program | General |
| Array of Contemporary American Physicists | General |
| Apprenticeship Completion Award Program | General |
| Any Channel Any Protocol | General |
| Adaptive Compute Acceleration Platform | General |
| Alabama Comprehensive Assessment Program | General |
| Associacao Automovel de Portugal | General |
| Association des Chauffeurs d'Autobus Prives | General |
| Agricultural Commodities Assurance Program | General |
| Agricultural Community Action Program | General |
| As Chill As Possible | General |
| Accountable Care Accountable Patients—reflecting | General |
| AXIS Camera Application Platform | General |
| Accessibility Communication Attitude and Participation | General |
| Arctic Contaminants Action Program | General |
| Animal Care Assistance Program | General |
| AOC Claims and Payment | General |
| American Council on Alcohol Problems | Governmental |
| Alternative Cover Assessment Program | Governmental |
| Annapurna Conservation Area Project | Governmental |
| Attorney and Consumer Assistance Program | Governmental |
| Attorney Consumer Assistance Program | Governmental |
| Asian Congress of Applied Psychology | International |
| Associazione Cristiana Aiuto Pratico | International |
| Autistic Children's Activity Program | Medical |
| Army Career and Alumni Program | Military and Defence |
| Army Cost Analysis Position | Military and Defence |
| Assessment Correlation and Analysis Process | Military and Defence |
| Advanced Composite Airframe Program | Military and Defence |
| Army Career Alumni Program | Military and Defence |
| Area Communications Electronics Capability | Military and Defence |
| Automated Content Access Protocol | Networking |
| African Census Analysis Project | Regional |
| Aroostook County Action Program | Regional |
| Application Configuration Access Protocol | Telecommunication |
