| Acronym | Definition |
|---|
| ACS | American Cancer Society |
| ACS | Assistant Chief of Staff |
| ACS | ACS (Automated Collection System) Call Site |
| ACS | Access |
| ACS | American Chemical Society |
| ACS | American Community Survey (US Census Bureau) |
| ACS | Acute Coronary Syndrome (medical condition) |
| ACS | Australian Computer Society |
| ACS | Academic Computing Services |
| ACS | Affiliated Computer Services, Inc. |
| ACS | American College of Surgeons |
| ACS | Acute Coronary Syndromes (journal) |
| ACS | American Constitution Society |
| ACS | Advanced Camera for Surveys (Hubble Space Telescope) |
| ACS | Access Control Server (Cisco Systems) |
| ACS | Access Control Server (Cisco) |
| ACS | Adobe Creative Suite |
| ACS | Army Community Service |
| ACS | American Constitution Society for Law and Policy |
| ACS | American Citizen Services (US Department of State) |
| ACS | Administration for Children's Services (New York City) |
| ACS | Association of Caribbean States |
| ACS | American Citizens Services (US State Department) |
| ACS | Access Control System(s) |
| ACS | ArsDigita Community System |
| ACS | Australian Customs Service |
| ACS | American Ceramic Society |
| ACS | Army Community Services |
| ACS | Automobil Club Der Schweiz (automobile club of Switzerland) |
| ACS | Australian Cinematographers Society |
| ACS | Automated Collection System |
| ACS | Attitude Control System |
| ACS | Association of Convenience Stores |
| ACS | Air Conditioning System |
| ACS | Associated Colleges of the South |
| ACS | Automated Commercial System |
| ACS | American Conifer Society |
| ACS | Administrative Computing Services (Boston University) |
| ACS | Anglo-Chinese School |
| ACS | American Community School (Abu Dhabi, UAE) |
| ACS | American Colonization Society |
| ACS | American Cetacean Society (whale conservation group) |
| ACS | Address Change Service |
| ACS | Aerial Common Sensor |
| ACS | Assessoria de Comunicação Social (Portuguese: Office of Social Communication; Brazil) |
| ACS | Applied Computer Science |
| ACS | Association for Canadian Studies |
| ACS | Adventist Community Services |
| ACS | Advances in Complex Systems |
| ACS | Auxiliary Communications Service |
| ACS | Air Control Squadron |
| ACS | Ambulatory Care Sensitive |
| ACS | American Cheese Society |
| ACS | Advanced Card Systems Ltd. |
| ACS | Automatic Class Selection |
| ACS | Alpha Chi Sigma (professional chemistry fraternity) |
| ACS | Automated Cartridge System |
| ACS | Abdominal Compartment Syndrome |
| ACS | Australian Correspondence Schools |
| ACS | Audio Car Stereo |
| ACS | Adjacent Channel Selectivity |
| ACS | Average Class Size |
| ACS | Asynchronous Communications Server |
| ACS | Australian Computer Science |
| ACS | Advanced Computer Services |
| ACS | Associate Customer Service (LOMA) |
| ACS | Auto Club South |
| ACS | Automation & Control Solutions |
| ACS | Analog Circuit Simulation |
| ACS | Applied Consultancy Solutions |
| ACS | Adaptive Control System |
| ACS | Admission Control Service |
| ACS | Antenna Control System |
| ACS | Automatic Control System |
| ACS | Associate, Customer Service |
| ACS | Advanced Composite Structures |
| ACS | Automobile Club de Suisse |
| ACS | Agile Combat Support |
| ACS | Anti-Chop System (paintball) |
| ACS | Automobile Consumer Services, Inc. |
| ACS | Add Compare Select |
| ACS | Applied Computer Solutions |
| ACS | Aged Care Services |
| ACS | Automated Characterization Suite |
| ACS | American Camellia Society |
| ACS | American College of Sofia (Bulgaria) |
| ACS | Association of Clinical Scientists |
| ACS | Advanced Communication System |
| ACS | Alcohol Countermeasure Systems |
| ACS | American Carbon Society (formerly American Carbon Committee) |
| ACS | Advanced Computer System |
| ACS | Active Control System |
| ACS | Acrocephalosyndactyly |
| ACS | AEGIS Combat System |
| ACS | Alaska Communications System |
| ACS | Advanced Communications Services |
| ACS | Adolescent Counseling Services |
| ACS | Air Commando Squadron |
| ACS | Acquisition of Signal |
| ACS | ALMA Common Software |
| ACS | Aged and Community Services (Australia) |
| ACS | Arabic Computer Systems |
| ACS | American Cooperative School (Suriname) |
| ACS | Access Control Set |
| ACS | Adult & Community Services (UK) |
| ACS | Automated Case Support System (FBI investigative database) |
| ACS | auxiliary crane ship (US Navy) |
| ACS | American Cryonics Society |
| ACS | Advanced Civil Schooling |
| ACS | Army Combat Shirt (US DoD) |
| ACS | American Computer Software |
| ACS | American Clematis Society |
| ACS | Aventis Crop Science |
| ACS | American Community Service |
| ACS | Acroá (SIL code for an extinct language of Brazil) |
| ACS | African & Caribbean Society |
| ACS | Air Circulation System |
| ACS | Alternating Current Signal |
| ACS | Airport Customer Service |
| ACS | Air Combat Systems (Northrop Grumman Corp.) |
| ACS | Alternate Care Site |
| ACS | American Cockatiel Society |
| ACS | Advanced Contact Solutions, Inc (Philippines) |
| ACS | Asian Cultural Society |
| ACS | Amphibious Command Ship |
| ACS | ATM Circuit Steering |
| ACS | Array Controller Software (HP StorageWorks) |
| ACS | American Crystal Sugar Company |
| ACS | Association of Cricket Statisticians and Historians |
| ACS | Automated Circulation System (System that connects to a library's item and patron database) |
| ACS | Automatic Contrast Selection |
| ACS | airspace control system |
| ACS | Anderson Consulting Group |
| ACS | Advertising Club Styria (Austria) |
| ACS | Aircraft Shelter |
| ACS | Anchorage Christian Schools |
| ACS | Agency Computer Systems, Inc. |
| ACS | Administrative and Commercial Studies |
| ACS | Action Code Script (Hexen scripting language) |
| ACS | Anion: Cation Symporter |
| ACS | Asymmetric Cooling System (NVideo card) |
| ACS | Automated Clearing System |
| ACS | Auxiliary Coordinate System |
| ACS | Auxiliary Cooling System |
| ACS | Advanced Camera System |
| ACS | Aircraft Cross Servicing |
| ACS | African Civil Society (UN) |
| ACS | Air Cavalry Squadron |
| ACS | Ada Compilation System |
| ACS | Automatic Calibration System |
| ACS | Autograph Card Signed (philatelics) |
| ACS | Association of Contemplative Sisters |
| ACS | Association for Children's Suffrage |
| ACS | Altitude Control System |
| ACS | Alexandria Choral Society (Alexandria, Virginia) |
| ACS | Associazione Cooperatori Salesiani (Italian: Salesian Cooperators Association) |
| ACS | Alarm and Control System |
| ACS | Aircraft Component Services |
| ACS | Audio Control System (aviation) |
| ACS | Australian Cinematographer Society |
| ACS | Asset Control System |
| ACS | Acid Scrubber |
| ACS | Air Capable Ship |
| ACS | Advanced Competitive Strategies, Inc. |
| ACS | Accounting Classification Structure |
| ACS | Ayrshire Cancer Support (Ayrshire, Scotland) |
| ACS | Arcadia Christian School |
| ACS | Administrative Control System |
| ACS | Applied Common Sense |
| ACS | Afloat Correlation System |
| ACS | Ashbourne Community School |
| ACS | Association of Consulting Scientists |
| ACS | Application Control Services |
| ACS | Alternative Conservation System |
| ACS | Archaeological Consulting Services, Ltd (Tempe, Arizona) |
| ACS | Army Corrections System |
| ACS | Access Control Store |
| ACS | Affiliated Construction Services, Inc. |
| ACS | Armored Cavalry Squadron |
| ACS | Arab Cultural Society |
| ACS | Alternating Current Synchronous |
| ACS | Approved Certification Scheme (UK) |
| ACS | Airborne Common Sensor (US DoD) |
| ACS | Automated Correspondence System |
| ACS | Air Campaign Simulator |
| ACS | Activity Classification Structure |
| ACS | Account Control System |
| ACS | Automated Classification System |
| ACS | American Communications Services, Inc. |
| ACS | Alternate Control System |
| ACS | Accent Computer Services Ltd. |
| ACS | Andrews Consulting Services (Cleveland, OH) |
| ACS | Automated Compounding System (North Carolina) |
| ACS | Afghans for a Civil Society |
| ACS | Aerospace Medicine Consultation Service (USAF) |
| ACS | Auriemma Consulting Group (Westbury, NY) |
| ACS | Automated Cost System (FTS 2000) |
| ACS | Atlanta Computer Society |
| ACS | Airport Certification Specification (aviation) |
| ACS | Advanced Cryptographic System |
| ACS | Army Combatives School |
| ACS | Aldus Color File |
| ACS | Accel Computer Services |
| ACS | Asthma Control Score |
| ACS | Air Crew Specialist |
| ACS | Acquisition & Command Support |
| ACS | Artillery Computer System |
| ACS | Army Communication System |
| ACS | Active Control Station |
| ACS | Avco Computer Services |
| ACS | Antenna Coupler Set |
| ACS | Acoustic Control Systems BV |
| ACS | Advanced Concepts Simulator |
| ACS | Active Compensation System (mechanical or electronic feed-forward or feedback system) |
| ACS | Autologue Computer Systems, Inc. |
| ACS | Access Control Signal |
| ACS | Automatic Certification System |
| ACS | Adaptive Circuit-based Shaping |
| ACS | Above Core Structures |
| ACS | Acceptance Criteria Specification |
| ACS | Adjacent Channel Separation |
| ACS | Archive and Catalogue System |
| ACS | Air Control Supervisor |
| ACS | Attitude Control Sub/system |
| ACS | Augmented Control System |
| ACS | Advanced Crew Stations |
| ACS | Andromeda Computing Systems |
| ACS | Austin Commedia Society |
| ACS | Afrika, Caribisch Gebied en de Stille Zuidzee (Dutch: African, Caribbean, and Pacific states) |
| ACS | Automated Chemical Systems |
| ACS | Application Communication Services |
| ACS | Atelier de Création de Services (French: Workshop of Creation of Services) |
| ACS | Advanced Conservation Systems, Inc. (Lancaster, California) |
| ACS | Administrative Communications Services |
| ACS | Alternate Command System |
| ACS | Airport Communication System |
| ACS | Alaskan Communications System |
| ACS | AARTS Controller Subsystem |
| ACS | Adiabatically Corrected Sudden (approximation) |
| ACS | Auxiliary Core Storage |
| ACS | Active Component Site |
| ACS | Adjacent Cell Separation |
| ACS | Alternate Care System |
| ACS | Absolute Consistent System |
| ACS | Assembly and Council Secretariat |
| ACS | Acoustic Support Console |
| ACS | Analyst-to-Console System |
| ACS | Asset Control Subsystem |
| ACS | Association des Cadres de Santé |
| ACS | Antenna Control Segment |
| ACS | Automatic Circle Savings (MCI) |
| ACS | Afloat Cryptologic Systems |
| ACs | Amigonian Cooperators |
| ACS | Antireticular Cytoxic Serum |
| ACS | Advanced Classification Schedule |
| ACS | Advanced Crew Systems |
| ACS | Automated Configuration Server |
| ACS | Artsy Computing Services |
| ACS | Adjunct Controlled Switch |
| ACS | Asil Construction Services |
| ACS | Auto Channel Shutdown (Cisco) |
| ACS | Aircraft Control Surveillance |
| ACS | Army Combat Simulations |
| ACS | Access Call Server |
| ACS | ATCCS Common Software |
| ACS | Automated Cashbook System |
| ACS | Aural Cuing System |
| ACS | Associate Services Center |
| ACS | Automatic Checkout System/Software |
| ACS | Ashland Central School (Maine) |