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