| Acronym | Definition |
|---|
| IB | Interface Bus |
| IB | International Business (various organizations) |
| IB | Ikonboard (web forum software) |
| IB | International Baccalaureate |
| IB | Introducing Broker |
| IB | Information Bulletin |
| IB | Intelligence Bureau (India, Pakistan) |
| IB | Iberia (Spanish airlines) |
| IB | Ibuprofen |
| IB | Interactive Brokers LLC |
| IB | Islas Baleares (Balearic Islands) |
| IB | InfiniBand (I/O specification, formerly called System I/O) |
| IB | Internet Business |
| IB | I'm Back |
| IB | Inboard |
| IB | Interface Builder (Apple Computers) |
| IB | In Bond |
| IB | In Band |
| IB | International Bank |
| IB | Immunoblotting |
| IB | International Bureau (FCC) |
| IB | Indian Bank |
| IB | Investment Banker |
| IB | Ibidem (Latin: In the Same Place; IBID is more common) |
| IB | Instruction Book |
| IB | I'm Bored |
| IB | Information Bureau |
| IB | Inquiry Board |
| IB | Interface Board |
| IB | Ice Breaker |
| IB | Input Buffer |
| IB | Itsy-Bitsy |
| IB | Inclusion Body |
| IB | Infectious Bronchitis (poultry viral disease) |
| IB | Industrial Base |
| IB | International Boundary |
| IB | Internet Bank |
| IB | Invision Board (message board) |
| IB | Isobar |
| IB | Instituto Balseiro (Bariloche, Argentina) |
| IB | Investigator's Brochure |
| IB | Ice Block (gaming, World of Warcraft) |
| IB | Individual Budgets (UK) |
| IB | Idiot Box (band) |
| IB | Intelligence Branch |
| IB | Inhaled Budesonide |
| IB | Intermediate Body |
| IB | Initial Budget |
| IB | Ik Bedoel (Dutch: I Mean) |
| IB | Ithaca Bakery (Ithaca, NY) |
| IB | Incline Bench (weight lifting) |
| IB | Incendiary Bomb |
| IB | Illinois Bell |
| IB | Induction Brazing |
| IB | Issue Book |
| IB | Intrabursal |
| IB | Inner Bottom (Shipbuilding) |
| IB | Invoice Book |
| IB | Inbye (mining) |
| IB | Instruction Buffer |
| IB | Interdit Bancaire (France) |
| IB | Investment Bureau |
| IB | Information Briefing |
| IB | Independent Bottler (Scotch whisky) |
| IB | Indicator Bit (ITU-T) |
| IB | Interactive Broadcasting (Internet company) |
| IB | Incest Baby |
| IB | Industrial Brownhoist |
| IB | Integrated Battlefield |
| IB | Identification Beacon |
| IB | Integration Backbone |
| IB | International Bacheloriate |
| IB | Intermediate Break |
| IB | Initial Bath |
| IB | Impact Burst |
| IB | Directie Internationaal Beleid (Dutch: direction for international politics) |
| IB | Import Bulletin |
| IB | Irregular Billing |
| IB | Information before Learning Task (online education) |