AP
AP, A&P, A-p, Ap, A/P, or ap may refer to:

Arts and entertainment
 AP (rapper) (born 1979), French rapper of Guadeloupian origin
 The A&P Gypsies, a musical radio program (1924–36)
 Action point (video gaming), required to be able to do something
 Atomic Puppet, an animated  series.

Publishing
 Associated Press, an American news agency
 "A&P" (story), by John Updike
 Alternative Press (music magazine)
 Ang Pamantasan, a Philippine student publication
 Palatine Anthology, a collection of Ancient Greek poems

Education
 Advanced Placement, North American program offering college level courses at schools
 Austin Peay State University, Clarksville, Tennessee, US

Engineering and military
 Anomalous propagation, or false radar echoes
 Armor-piercing, a type of ammunition
 Transport support ship (U.S. Navy hull classification symbol: AP)

Finance
 Accounts payable, in accounting 
 Hungarian adópengő (currency code: AP)

Organizations
 Agricultural and Pastoral Shows (A&P) in New Zealand
 Administration Police, a Kenyan security unit
 Polish Aero Club (Aeroklub Polski)
 Armenian Power, an Armenian-American gang in Los Angeles, US
 Atlantic Philanthropies, a foundation

Businesses
 The Great Atlantic & Pacific Tea Company or A&P supermarket chain
 A & P Food Stores Building, St. Louis, Missouri, US
 A&P Canada, former supermarket chain
 A&P Group, a ship repair  company, formerly Austin & Pickersgill
 Air One airline , Rome, Italy, IATA code
 Atlantic and Pacific Railroad (A&P)
 Automotive Products, a former UK  company

Politics
 Acción Popular (disambiguation), the name of three political parties in Latin America
 Justice Party (Turkey) (Adalet Partisi), a former political party
 People's Action (Romania) (Acţiunea Populară), a former political party
 Popular Alliance (Spain) (Alianza Popular), a former political party in Spain
 Norwegian Labour Party (Arbeiderpartiet)

Mythology
 Ap (ghost), a spirit of Khmer folklore
 Ap (water), the waters in Vedic mythology

Places
 Andhra Pradesh, India
 Province of Ascoli Piceno, Italy, vehicle registration code

Psychology
 Attachment parenting, a parenting philosophy

Science and technology

Computing
 AP (complexity), or PSPACE, problems decidable by a Turing machine
 Wireless access point, for WiFi networking
 Address plus Port (A+P), a technique for sharing IPv4 addresses
 Age progression of a photograph to show aging

Mathematics
 Arithmetic progression

Medicine
 Alkaline phosphatase, an enzyme
 Area postrema, a part of the brain
 Colporrhaphy or A&P repair, of vaginal walls

Science
 Ammonium perchlorate
 Ap and Bp stars

Other uses
 ap, a Welsh patronymic
 ap. a classical abbreviation
 Adjective phrase