- BACI stands for Before–after Control-Impact (experimental designs in environmental science)
- BACI stands for Burnaby Association for Community Inclusion (Burnaby, BC, Canada)
- BACI stands for Banc of America Capital Investors
- BACI stands for Bell Atlantic Communications, Inc. (now Verizon Long Distance)
- BACI stands for Brazilian-American Cultural Institute
- BACI stands for Bovine Anti-Cryptosporidium (immunoglobulin)
- BACI stands for Bangladesh Association of Construction Industry
- BACI stands for Brazilian-American Cultural Association
- BACI stands for Business Management, Agency, Comparables & Investments (UK)
BACI