BCI is used as an abbreviation for:
- Bacolod Chicken Inasal, a restaurant chain in the Philippines
- Banco de Crédito e Inversiones, a Chilean bank
- Banco de Comércio e Indústria, in Angola, Africa
- Banco Comercial e de Investimentos, in Mozambique, Africa
- Bar Council of India
- Barro Colorado Island, an island located in the Lake Gatún portion of the Panama Canal
- Better Cotton Initiative, is a not-for-profit membership association, and is trying to make global cotton production better for the people who produce it, better for the environment
- Bat Conservation International, an environmental organization dedicated to bats
- Battery Council International, a battery industry trade association
- BCI Bus, an Australian bus and coach manufacturing company
- BCI Engineers & Scientists, Inc., formerly Bromwell & Carrier, Inc.
- Blackstone Career Institute, online training for paralegal, medical billing and coding, medical transcription and other careers
- Blue Circle Industries, a major cement manufacturing company, part of Lafarge since 2001
- Bluevale Collegiate Institute
- Brain-computer interface, an interface between brains (human or animal) and computer systems
- Brantford Collegiate Institute
- Broadcasting Commission of Ireland
- Brockville Collegiate Institute
- Business Continuity Institute
- Bytecode Interpreter, in computing
- Body Condition Index, in biology (actual body mass of an animal divided by optimal theoretical body mass)
- Bone Conduction Implant, a transcutaneous bone conduction hearing implant device.