| Academic Competition Federation | Academic & Science |
| Academic Competition Foundation | Academic & Science |
| Acid Concentrator Feed | Academic & Science |
| Action Contre La Faim | Associations & Organizations |
| Australian Conservation Foundation | Associations & Organizations |
| Associação Chapecoense de Futebol | Associations & Organizations |
| Adivasi Cobra Force | Associations & Organizations |
| Arab Chess Federation | Associations & Organizations |
| American Checker Federation | Associations & Organizations |
| Ambuja Cement Foundation | Business |
| American Coach Foundries | Business |
| Activated Carbon Filter | Business |
| AmeriCredit Corporation | Business |
| American Car Foundry | Business |
| A Credit Fiasco | Business |
| Alternative Commercial Finance | Business |
| L’Association des Consultants en Foresterie du Québec | Business |
| American Composers Forum | Community |
| AIDS Care Fund | Community |
| Advocate Charitable Foundation | Community |
| Albany County Fair | Community |
| Administration for Children and Families | Community |
| Appanoose County Fair | Community |
| American Communications Foundation | Community |
| Austrian Cultural Forum | Community |
| Alliance for Children and Families | Community |
| Air Cargo Forum | Community |
| Alhambra Charity Fund | Community |
| Alliance Community Fellowship | Community |
| Assistant Conservator of Forest | Community |
| Arewa Consultative Forum | Community |
| Adventist Christian Fellowship | Community |
| Aspen Community Foundation | Community |
| Austin Christian Fellowship | Community |
| Alliance Christian Fellowship | Community |
| Authentication Control Function | Computer and Networking |
| Advanced Computing Facility | Computing |
| Access Control Field | Computing |
| Association Control Function | Computing |
| Acceptance Filter | Computing |
| Admission Confirmation | Computing |
| Automation Configuration File | Computing |
| Authentication Connection Forum | Computing |
| Application Copy Failover | Computing |
| Amazon Cloud Front | Computing |
| Amazon Cloud Formation | Computing |
| Aws Cloud Formation | Computing |
| Advanced Communication Function | Computing |
| Access Control File | Computing |
| Advanced Communication Facility | Computing |
| Agent Character File | Computing |
| Admission Control Function | Computing |
| Adobe Custom Filter | Computing |
| Advanced Chipset Feature | Computing |
| Active Contact Flange | Contact |
| Advanced Computer Feasability | Database Management |
| Auto-correlation Function | Electronics |
| Anisotropic Conductive Film | Electronics |
| Adobe Photoshop Custom Filter | File Type |
| Achievement Collecting Fag | General |
| Animal Component Free | General |
| Apalachicola Chattahoochee Flint | General |
| Acceptance Check Flight | General |
| Associazione Calcistica Fiorentina | General |
| Airbus Cabin Flex | General |
| Alabama Coastal Foundation | General |
| American Culinary Federation | General |
| Advanced Coma Free | General |
| Arts Center Foundation | General |
| Accuracy Control Feel | General |
| Automated Control Function | General |
| Agricultural Construction Forestry | General |
| Acute Cold and Flu | General |
| Anti Counterfeit and Fraud | General |
| Activated Coke Fines | General |
| Active Citizen Force | General |
| Automobile Club Francais | General |
| Automotive Carbon Fibers | General |
| Amsoil Diesel Cold Flow | General |
| Air Car Factories | General |
| American Car and Foundry | General |
| Autobianchi Club de France | General |
| Axle Correction Factor | General |
| Amicale Citroen France | General |
| Asociatia Club Ford | General |
| Abarth Club Florida | General |
| Automobile Club de Fasri | General |
| Advanced Custom Fields | General |
| Arizona Community Foundation | General |
| American Chestnut Foundation | General |
| and ACF definition | General |
| Armored Combat Framework | General |
| Army Cadet Force | Governmental |
| Assistant Conservator of Forests | Governmental |
| Area Control Facility | Governmental |
| Association of Consulting Foresters | Governmental |
| Army Cadet Forces | Governmental |
| Asociación Cristiana Femenina | International |
| Asian Credit Fund | International |
| Asian Christian Fellowship | International |
| Alt Comp Freeware | Internet |
| Actual Cubic Feet | Measurement Unit |
| Agriculture Christian Fellowship | Medical |
| Animal Concerns Forum | Medical |
| African Clawed Frog | Medical |
| Ante Cubital Fossa | Medical |
| Aberrant Crypt Foci | Medical |
| Access Control Framework | Medical |
| Accessory Clinical Findings | Medical |
| Active Case Finding | Medical |
| Animal Cancer Foundation | Medical |
| Acute Care Facility | Medical |
| Adult Care Facility | Medical |
| Anterior Cervical Fusion | Medical |
| Anterior Cranial Fossa | Medical |
| Association of Charitable Foundations | Medical |
| Access Control Facility | Military and Defence |
| Airlift Clearance File | Military and Defence |
| Air Contingency Force | Military and Defence |
| Advanced Communications Function | Networking |
| Saint Lucian Creole French | Regional |
| Ateliers et Chantiers de France | Regional |
| Alaska Community Foundation | Regional |
| American Cricket Federation | Sports |
| Australian Chess Federation | Sports & Games |
| Access Coordination Function | Telecommunication |
| Advanced Communications Facility | Telecommunication |
