- ACP (ammunition) , an Ammunition standard
- ACP (software) , a Software package.
- ACP Countries , the countries of Africa, Caribbean and Pacific that are signatories of the Cotonou Agreement
- AC Propulsion , a California electric vehicle drive systems company founded in 1992 which produces the Tzero and Backtracking Genset
- Acepromazine , a sedative used commonly in veterinary medicine
- Admin Control Panel , a panel on forums and websites for editing setup (i.e. phpBB)
- Advanced Care Paramedic , a diploma progam accredited by the Canadian Medical Association
- Aerospace Cadets Of The Philippines , a youth program oriented in Aerospace technology, whose aim is to promote national enthusiasm in the Philippines .
- Air Cadet Publication, a publication which describes a section of the Air Training Corps and is vital to the structure and smooth running of the organisation.
- Airlines Control Program , an operating system developed by IBM for processing Airline reservations and related data
- Airport Core Programme , the construction project of Hong Kong International Airport and related in Hong Kong
- Algebra Of Communicating Processes , an algebraic approach to reasoning about Concurrent Systems
- Allied Communication Protocol , a military protocol specification by the CCEB .
- American College Of Physicians , a national organization of doctors of internal medicine in the United States
- Analog Content Protection , a technology from Macrovision which protects content on optical video discs from Analog Piracy {Link without Title}
- Application Communication Protocol , a vehicle Telematics protocol created by Motorola
- Architects' Co-Partnership , prominent British architectural company
- Armenian Communist Party , a communist political party in Armenia
- Array Control Processor
- Associate Computing Professional , a certification offered by the Institute for the Certification of Computing Professionals
- Associated Collegiate Press , a national membership organization for college student media in the United States
- Associated Construction Publications , a national network of regional publications that serve the construction industry. Owned by Reed Construction Data.
- Association Of Chess Professionals , and organisation to protect professional Chess players' rights and promote the game of chess
- Atmospheric Chemistry And Physics , a journal published by the European Geosciences Union
- Audax Club Parisien , organizer of the Paris-Brest-Paris grand randonnee, and worldwide sanctioning body for Brevet (randonnee/audax) cycling events
- Australian Consolidated Press , a major publisher of Magazine s in Australia
- Automatic Cell Planning , a term used in mobile communications
- Automovel Clube De Portugual , an automobile club in Portugal
- Autoridad Del Canal De Panamá (Panama Canal Authority), the authority in charge of the Panama Canal
- Alternative Certification Programs , programs that provide opportunities for people from various educational backgrounds and walks of life to become teachers.
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