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