| Acronym | Definition |
|---|
| BI | Bisexual |
| BI | Bank Indonesia |
| BI | Brain Injury |
| BI | Bohemia Interactive (game development company) |
| BI | Block Island (Rhode Island) |
| BI | Background Information |
| BI | Black Ice (Star Wars novel) |
| BI | Bielefeld (Germany) |
| BI | Bismuth |
| Bi | Bidirectional |
| BI | Bodily Injury |
| BI | Black Iron |
| BI | Biological Indicator |
| BI | Burn-In |
| BI | Bainbridge Island (Washington state) |
| BI | Background Investigation |
| BI | Bad Influence (band) |
| BI | Banca d'Italia (Italian central bank) |
| BI | Brain Informatics |
| BI | Billing Instructions |
| BI | Behavioral Interventions |
| BI | Beyond Imagination |
| BI | Barthel Index |
| BI | Royal Brunei Airlines (IATA airline code) |
| BI | Binary Input |
| BI | Breidbart Index (USENET spam metric) |
| BI | Bibliographisches Institut (German book publisher) |
| BI | Body Inflation (artificial physical transformation) |
| BI | Biella, Piemonte (Italian province) |
| BI | Bribie Island (Australia) |
| BI | Birth Index |
| BI | Bavarian Inn (Lake Ronkonkoma) |
| BI | Bloody Idiot |
| BI | Baccalauréat International (French: International Baccalaureate) |
| BI | Book Inventory |
| BI | Beer Institute |
| Bi | Biot Number (heat transfer) |
| BI | Battlefield Information |
| BI | Before Internet |
| BI | Braniff International (defunct US airline) |
| BI | Backplane Interconnect |
| BI | Buffer Index |
| BI | Bibliotheca Islamica (Islamic Library - German Oriental Society) |
| BI | battle injury (US DoD) |
| BI | Basis of Issue |
| BI | Blanking Input |
| BI | (Run) Batted In (Baseball) |
| BI | Battlespace Infosphere |
| BI | Backward Indicator |
| BI | Base-In Prism (ophthalmology) |
| BI | Branch Immaterial |
| BI | Behavior Inhibition (psychology) |
| BI | Battlefield Illumination |
| BI | Bebco Industries (La Marque, TX) |
| BI | Batch Interactive (IBM) |
| BI | Battlefield Interdiction |
| BI | Basketball Ireland |
| BI | Beni Immobiliari (Italian) |
| BI | Brand Institute, Inc (Miami, FL) |
| BI | Branch Insertion |
| BI | Bell Intrigna |
| BI | Biotehnologii Industriale (Romania) |
| BI | Bayer Industrieprodukte (Cologne, Germany) |
| BI | Build Increment |
| BI | Bannockburn Institute |
| BI | Bilhete de Identificação |
| BI | Bedriftsokonomisk Institutt (Norwegian: Business Institute) |
| BI | Brigade Internationaliste |
| BI | Signaling Identification Assigned By Exchange B |
| BI | Brinch Import |
| BI | Broadcast Intelligence |
| BI | Bus Interconnect |
| BI | Business Income |
| BI | Business Instruction |
| BI | Business Integration |
| BI | Business Intelligence |
| BI | Buddy Icon |
| BI | Boehringer Ingelheim (Germany) |
| BI | British India |
| BI | Burning Issues |
| BI | Bumrungrad International (Thailand) |
| BI | Bubble Interface |
| BI | British Israelism |
| BI | Burundi (ISO country code) |
| BI | Briefing to Industry |
| BI | Brookings Institution |
| BI | Business Impact Test |
| BI | Business Interruption (insurance) |
| BI | Business Improvement |