API (disambiguation)

An API, or application programming interface, is any defined inter-program interface.

API or api may also refer to:

Companies and organizations

 * Academic Programs International, an American study-abroad provider
 * American Petroleum Institute, an American trade-lobbying and international-standardization organization
 * AmeriStat Pharmaceuticals, Inc., a US-based international wholesaler and exporter of pharmaceuticals and medical supplies
 * Animal Protection Institute, an American non-profit organization
 * Anonima Petroli Italiana, an Italian petrol (gasoline) company
 * Associated Producers Incorporated a B picture subsidiary of 20th Century Fox
 * Athletes' Performance Institute, an American training facility for competitive athletes
 * Australian Pharmaceutical Industries
 * Australian Property Institute, an Australian professional organization in valuation
 * Automated Processes, Inc., an American audio electronics company
 * Automobile Products of India, an Indian automotive company
 * Aviation Partners Inc., an American aviation components company

In education

 * Academic Performance Index, a measure of scholastic performance used in California, United States
 * Auburn University, formerly known as Alabama Polytechnic Institute

Places

 * Api (mountain), Nepal
 * Api Chamber, a large cave chamber in Malaysia
 * Mount Api, Malaysia

In politics

 * Alliance for Italy, a centrist political party in Italy
 * Arab Peace Initiative, a peace initiative proposed in 2002 at the Beirut Summit of the Arab League

In science and technology

 * Active pharmaceutical ingredient, a basic component of any medicine or pharmaceutical drug
 * Advanced primer ignition, a type of blowback operation for firearms that ignites the primer when the bolt is still moving with the goal of increasing rate of fire and decreasing felt recoil.
 * Petroleum industry nomenclature deriving from American Petroleum Institute
 * API gravity, a measure of the density of petroleum
 * API number, a unique identifier applied to each petroleum exploration or production well drilled in the United States
 * API unit, a standard measure of natural gamma radiation measured in a borehole
 * Analytical Profile Index, a miniaturized panel of biochemical tests compiled for identification of groups of closely related bacteria
 * API oil-water separator
 * Air Pollution Index, a measure of air quality used in Hong Kong and Malaysia
 * Armor-piercing incendiary, a type of armor-piercing shot and shell
 * Atmospheric pressure ionization, a type of ionization in mass spectrometry
 * Apnea–hypopnea index, an index used to indicate the severity of sleep apnea

Other uses

 * Advance passenger information, passenger name record collected by commercial transportation operations
 * Asian-Pacific Islander
 * Aviation Preflight Indoctrination, the first major phase of training for a United States Naval Aviator
 * Announcement in the public interest, an alternate name for a public-service announcement
 * International Phonetic Alphabet, a system of phonetic notation (known in French as the alphabet phonétique international)
 * Api (apple), an apple cultivar.