ACP
- A Connecticut Party (1990)
- A Coruña (Parliament of Galicia constituency)
- AC Propulsion
- ACP1
- ACP2
- ACP3
- ACPS (disambiguation)
- Aberdeen Central (Scottish Parliament constituency)
- Aberdeen Central (UK Parliament constituency)
- Aberdeenshire Central (UK Parliament constituency)
- Academy Chicago Publishers
- Acampe
- Accessory gland protein
- Acepromazine
- Acetophenone
- Active Citizen Project
- Acyl carrier protein
- Address confidentiality program
- Advance care planning
- Affordable Connectivity Program
- African, Caribbean and Pacific Group of States
- Airport Core Programme
- Albany College of Pharmacy
- Algebra of Communicating Processes
- Alliance for Climate Protection
- Allied Communications Publications
- Aluminium Composite Panel
- American Charities for Palestine
- American College of Pathology
- American College of Pediatricians
- American College of Physicians
- American College of Prosthodontists
- American College of Psychiatrists
- American Communist Party (2024)
- American Computer and Peripheral
- An Coimisiún Pleanála
- Anterior chamber paracentesis
- Appalachian College of Pharmacy
- Are Media
- Asian citrus psyllid
- Asociación Cívica de Potosí
- Assistant Commissioner of Police
- Associated Collegiate Press
- Associated Construction Publications
- Association of Cancer Physicians
- Association of Chess Professionals
- Association of Chinese Professionals
- Atari Coldfire Project
- Atmospheric Chemistry and Physics
- Attorney–client privilege
- Audax Club Parisien
- Australian Citizens Party
- Australian College of Pharmacy
- Autologous Conditioned Plasma
- Automatic Colt Pistol
- Automatic and controlled processes
- Average CPU power
- Eastern Acipa language
- IBM Airline Control Program
- Mid-level practitioner
- Sahand Airport