APA

APA most often refers to:
 * American Psychological Association
 * APA style, a writing style guide from the American Psychological Association

APA or Apa may also refer to:

Entertainment and media

 * Acolytes Protection Agency, a professional wrestling tag-team
 * Agency for the Performing Arts, a talent and literary agency
 * Father (1966 film) (Apa)

Government and politics

 * Administrative Procedure Act (United States), a statute controlling government agency actions
 * Administrative Procedure Act (Switzerland)
 * Advance pricing agreement
 * Approved Publication Arrangement

Language

 * Americanist phonetic notation or the American phonetic alphabet
 * Southern Athabaskan languages excluding Navajo (ISO 639 code: apa)

Australia

 * APA Group (Australia), electricity generation and gas pipeline company
 * Aborigines Progressive Association
 * Australian Parkour Association
 * Australian Progressive Alliance

Japan

 * Japan Advertising Photographers' Association
 * APA Group (Japan), a Japanese hotel chain

United Kingdom

 * All Peoples' Association (1930–1936), a British organisation for international amity
 * Army Prosecuting Authority, former government body
 * Association of Publishing Agencies

United States

 * APA – The Engineered Wood Association, formerly the American Plywood Association
 * APA Corporation, an energy company
 * A-P-A Transport Corp., New Jersey
 * Adirondack Park Agency, New York
 * Agency for the Performing Arts, a talent and literary agency
 * Allied Pilots Association, a labor union for American Airlines pilots
 * American Payroll Association
 * American Philological Association, devoted to Greek and Roman civilization
 * American Philosophical Association
 * American Planning Association, representing the field of city and regional planning
 * American Polygraph Association
 * American Poolplayers Association
 * American Poultry Association
 * American Protective Association, a former anti-Catholic organization
 * American Psychiatric Association
 * Anglican Province of America, a church
 * Austin Peace Academy, an Islamic school in Texas

Elsewhere

 * Association of Panamerican Athletics
 * Austria Press Agency (German: Austria Presse Agentur)
 * Azerbaijan Press Agency
 * NSDAP Office of Foreign Affairs (Außenpolitisches Amt der NSDAP), a Nazi Party organization
 * Peruvian Astronomy Association (Spanish: Asociación Peruana de Astronomía), in Peru

People

 * Apa (footballer) (born 2000), Spanish footballer
 * Apa of Slavonia, 12th-century Hungarian noble
 * Apa Sherpa, a Nepali Sherpa and famous Mt. Everest mountaineer
 * KJ Apa (born 1997), New Zealand actor

Asia

 * Apa, Acıpayam
 * Upu, a historic region surrounding Damascus (alternative transliteration)
 * The Hong Kong Academy for Performing Arts

North America

 * Apache Railway, Arizona, U.S. (by reporting mark)
 * Anderson Preparatory Academy, a school in Indiana, United States
 * Centennial Airport, Colorado, United States (by IATA code)

Other places

 * Antarctic Protected Area, several types of zone on Antarctica
 * Apa, Nigeria, a local government area in Benue
 * Apa, Satu Mare, a commune in Romania

Maritime

 * Apa (ship), an Amazonas-class corvette of the Brazilian Navy
 * Advance provisioning allowance
 * A retired US Navy hull classification symbol: Attack transport (APA)

Science and technology

 * Aldosterone-producing adenoma
 * All points addressable
 * Amplified piezoelectric actuator
 * Atypical polypoid adenomyoma
 * Apa, a type of Bronze Age sword named after the Romanian village

Other uses

 * Apa, Coptic form of Ab (Semitic)
 * Amateur press association, any group of people who self-publish material among themselves
 * American pale ale
 * Antarctic Protected Area, several types of place on Antarctica
 * Asian Pacific American
 * Asset purchase agreement
 * Australian Postgraduate Awards