API (disambiguation)

API, originally Advanced Programming Interface but now more commonly known by its near synonym, Application programming interface, is any defined inter-program interface.

API or api may also refer to:

* Api (mountain), a mountain in Nepal
* API gravity, a measure of the density of petroleum
* Academic Performance Index, a measure of scholastic performance used in California, United States
* Academic Programs International, an American study-abroad provider
* Active pharmaceutical ingredient, a basic component of any drug
* Advance Passenger Information, passenger information collected by commercial transportation operations
* Air Pollution Index, a measure of air quality used in Hong Kong and Malaysia
* AmeriStat Pharmaceuticals, Inc., a US-based International wholesaler and exporter of pharmaceuticals and medical supplies
* American Petroleum Institute, an American trade organization
* Animal Protection Institute, an American non-profit organization
* Australian Property Institute, an Australian trade organization
* Automated Processes, Inc., an American audio electronics company
* Aviation Partners Inc., an American aviation components company
* Armor-piercing incendiary, a type of armor-piercing shot and shell
* International Phonetic Alphabet, a system of phonetic notation; "API" refers to the French name for the system, "Alphabet phonétique international"
* Analytical Profile Index, a miniaturized panel of biochemical tests compiled for identification of groups of closely related bacteria.

For information on Wikipedia APIs, see .