ABI is an acronym or abbreviation that may refer to:
- Abilene Regional Airport (IATA airport code), in Abilene, Texas, United States
 - Abitur
 - AbiWord
 - Acquired brain injury
 - Advanced Baseline Imager on GOES-R satellite
 - Agencia Boliviana de Información, a Bolivian press agency
 - Alabama Bureau of Investigation
 - Albanian Boys Inc
 - American Beverage Institute
 - American Biographical Institute
 - Anheuser-Busch InBev
 - Ankle-Brachial Index
 - Application binary interface, a low-level computer programming interface
 - Applied Biosystems
 - Arabian Business International, an international magazine
 - Association of British Insurers
 - Auditory brainstem implant
 - Organic Union International, a.k.a. Association biologique internationale, a non-governmental organization against degenerative diseases
 
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