| Acronym | Meaning |
 | ACDF | Advanced Chemical Diagnostics Facility |
 | ACDWG | Atmospheric Center Of Data Working Group |
 | ACE | Alliance For Clean Energy |
 | ACE | American Council On Education |
 | ACE | Antarctic Current Experiment |
 | ACE | Aerosol Characteristics Experiment |
 | ACE | Accelerated Computing Environment |
 | ACE-1 | Aerosol Characterization Experiment |
 | ACE-ASIA | Asian Pacific Regional Aerosol Characterization Experiment |
 | ACEC | American Consulting Engineers Council |
 | ACEP | DOC Advisory Committee |
 | ACF | Acid Concentrator Feed |
 | ACF | Automatic Control Feature |
 | ACFM | Actual Cubic Feet Per Minute |
 | ACFM | Alternating Current Frequency Modulation |
 | ACG | Advanced Computing Group |
 | ACGIH | American Conference Of Governmental Industrial Hygienists |
 | ACH | Air Changes Per Hour |
 | ACHEM | Atmospheric Chemistry Model |
 | ACI | Advanced Computing Initiative |
 | ACI | Automatic Closure And Interlock |
 | ACIS | Automated Chemical Inventory System |
 | ACIS | Academic Information Systems |
 | ACL | Advanced Computing Laboratory |
 | ACL | Alternative Concentration Level/limit |
 | ACL | Auxiliary Cooling Loop |
 | ACM | Association For Computing Machinery |
 | ACM | Advanced Conventional Munitions |
 | ACM | Advanced Cruise Missile |
 | ACM | Asbestos-containing Material |
 | ACME | Airborne Carbone In The Mountains Experiment |
 | ACN AWIPS | Communication Network |
 | ACNFS | Advisory Committee On Nuclear Facility Safety |
 | ACO | Administrative Consent Order |
 | ACO | Advance Change Order |
 | ACO | Atomic Coordinating Office |
 | ACO/UK | ACO/United Kingdom |
 | ACOS | Advanced Coronal Observing System |
 | ACP | Acoustic Doppler Profilers |
 | ACR | Active Cavity Radiometer |
 | ACR | Air Conditioner |
 | ACRIM | Active Cavity Radiometer Irradiance Monitor |
 | ACRIM II | Active Cavity Radiometer Irradiance Monitor |
 | ACRS | Advisory Committee |
 | ACRT | Aircraft Report |
 | ACS | American Chemical Society |
 | ACS | Administrative Computing And Systems |
 | ACS | Automated Cartridge System |
 | ACS | Account Control System |
 | ACS | Aldus Color File |