| ACI |
Advanced Cyberinfrastructure (changed to OAC) |
| ACIP |
Advisory Committee on Immunization Practices |
| ACIR |
Agricultural Commodity Import Requirements |
| ACIS |
Animal Care Information System (unavailable as of 8/16) | Automated Case Information System |
| ACL |
Administration for Community Living | Analytical Chemistry Laboratory (unable to verify 12/17) |
| ACM$ |
Award Cash Management $ervice |
| ACMAP |
Atmospheric Composition Modeling and Analysis Program (older link archive) |
| ACMD |
Applied and Computational Mathematics Division | Applied Chemicals and Materials Division |
| ACME |
Advanced Combustion via Microgravity Experiments |
| ACMUI |
Advisory Committee on the Medical Uses of Isotopes |
| ACNS |
Advisory Committee for Nuclear Security |
| ACO |
Aircraft Certification Office (changed to Certification Branches) |
| ACO REACH |
Accountable Care Organization Realizing Equity, Access, and Community Health (older link archive) |
| ACORN |
Accelerator Controls Operations Research Network |
| ACOSS |
Animal Contact Outbreak Surveillance System |
| ACP |
Affordable Connectivity Program |
| ACPAC |
Aviation Consumer Protection Advisory Committee |
| ACPD |
Advisory Commission on Public Diplomacy (older link archive; archive2) | Aviation Consumer Protection Division |
| AcqNet |
Acquisition Central |
| ACRES |
Assessment, Cleanup and Redevelopment Exchange System (older link archive; archive2; archive3) |
| ACRGP |
Airport Coronavirus Response Grant Program |
| ACRS |
Advisory Committee on Reactor Safeguards |
| ACS |
American Community Survey | Automated Collection System | Office of American Citizens Services and Crisis Management (unable to verify 6/20) |
| ACS-ED |
American Community Survey Education Tabulation |
| ACSFA |
Advisory Committee on Student Financial Assistance (defunct) |
| ACSL |
Adaptive Cropping Systems Laboratory (older link archive) |
| ACSNCA |
Advisory Committee for the Sustained National Climate Assessment (also, SNCAFAC; defunct 8/17) |
| ACT-America |
Atmospheric Carbon and Transport - America (older link archive) |
| ACTION II |
Accelerating Change and Transformation in Organizations and Networks II (older link archive) |
| ACTIV |
Accelerating COVID-19 Therapeutic Interventions and Vaccines |
| ACTIV TRACE |
ACTIV Tracking Resistance and Coronavirus Evolution |
| ACToR |
Aggregated Computational Toxicology Online Resource (retired; older link archive) |
| ACTR |
Air Travel Consumer Reports |
| ACTVS |
Automated Cryptographic Validation Testing System |
| ACU |
Animal Care and Use (changed to OACU) |
| ACUS |
Administrative Conference of the United States |
| ACVFA |
Advisory Committee On Voluntary Foreign Aid |
| ACVP |
AIDS and Cancer Virus Program (older link archive) |
| ACWI |
Advisory Committee on Water Information (inactive as of 12/19; older link archive) |
| ACWS |
Advisory Committee for Women's Services (older link archive; archive2) |
| ACWV |
Advisory Committee on Women Veterans |
| ACYF |
Administration on Children, Youth, and Families |
