ACS may refer to:

• cs, a Hungarian town

Companies and commerce

• ACS:Law, a British law firm specialising in intellectual property cases
• Advanced Composites Solutions, engineering company specialized in composite materials technology
• Affiliated Computer Services (stock symbol: ACS), a business and technology outsourcing company
• Air Cess, cargo airline based in Sharjah, United Arab Emirates
• Alaska Communications System, former name of AT&T Alascom, an American communications services company
• Alaska Communications Systems, an American communications services company, distinct from AT&T Alascom
• Alternative compensation system, a way to allow reproduction of digital copyrighted works while still paying the authors and copyright owners
• Grupo ACS (Actividades de Construcci n y Servicios, S.A.; IBEX-35 stock symbol: ACS), a civil engineering firm based in Madrid, Spain

Education

• American College of Sofia, a prestigious secondary school in Sofia, Bulgaria
• American Community School at Beirut, an international private school located in Beirut, Lebanon
• American Community School in Amman, an international school in Amman, Jordan
• ACS International Schools, a group of international schools in the UK
• Anglo-Chinese School, Singapore, a group of Methodist schools in Singapore
• Anglo-Chinese Schools, Malaysia, a group of Methodist schools in Malaysia
• Arkansas Correctional School, a school system in prisons in Arkansas
• Associated Colleges of the South, a group of leading liberal arts colleges in the United States
• Assumption College School, a catholic high school in Ontario, United States
• Alperton Community School, a secondary school in London, UK
• American Community Schools, an English-speaking private school system in Athens, Greece
• Avery Coonley School, a private elementary school in Downers Grove, Illinois, United States
• The Lehman Alternative Community School, a combined middle and high school which provides alternative education in Ithaca, New York, United States

Entertainment

• Adam Carolla Show, American morning radio program
• Adventure Construction Set, a program used to construct Ultima-type videogames
• Antichrist Superstar, a 1996 rock album by Marilyn Manson
• Apolyton Civilization Site, a website for players of the Civilization series of computer games

Government and military

• Accredited Certification Scheme, in the United Kingdom, a qualification scheme for workers dealing with gas appliances (see Gas Safe Register)
• Aerial Common Sensor, a reconnaissance aircraft airframe for the United States Army and Navy
• American Community Survey, a project of the United States Census Bureau
• Approved Contractor Scheme, in the United Kingdom, a quality assurance scheme for the private security industry (see Security Industry Authority)
• Army Combat Shirt, flame-resistant shirt developed for the United States Army
• Attitude control system, a spacecraft system
• Australian Customs Service, the Australian government agency responsible for the Australian border
• Auxiliary crane ship, a vessel of the United States Navy

Organizations and societies

• American Cancer Society, an American medical organization
• American Chemical Society, an American professional association
• American Colonization Society, an organization that helped in founding Liberia as a colony for freed slaves
• American Constitution Society for Law and Policy, an organization of lawyers and law students in the United States
• American Cryonics Society, non-profit corporation that supports and promotes research and education into cryonics
• American CueSports Alliance, a US-based pool league
• Association of Caribbean States
• Association of Cricket Statisticians and Historians, an association founded England in 1973 to collect cricket data
• Audience Council Scotland
• Australian Cinematographers Society
• Australian Computer Society, an association for information and communications technology professionals

Science, technology, and medicine

• ALMA Common Software, a software framework developed for Atacama Large Millimeter Array
• Acetyl-CoA Synthetase, an enzyme
• 2-Amino-3-carboxymuconic semialdehyde, a chemical in tryptophan metabolism
• Access Control Service, a cloud-based service for authentication and authorization
• Access Control Server, a component of Cisco's Network Admission Control technology
• ACS-1 and ACS-360, supercomputers designed but never completed in the 1960s by the IBM Advanced Computing Systems
• Action Code Script, a scripting language used in video games such as HeXen and Doom ports
• Acute coronary syndrome, a form of chest pain due to reduced oxygen supply to the heart muscle
• Adobe Creative Suite, a software package by Adobe Inc.
• Advanced Camera for Surveys, an instrument aboard the Hubble Space Telescope
• Advanced Control System, framework for building complex control systems
• American College of Surgeons, a fellowship of American surgeons
• American Cancer Society, a voluntary health organization dedicated to eliminating cancer
• Advanced Cataract Surgery, the modern method of cataract removal using phacoemulsification
• Anticenter shell, a supershell located outside of the galaxy
• Auto Configuration Server, management server for TR-069 compliant Customer Premises Equipment
• Automated Cartridge System, an information retrieval system, often used for library management

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