| Acronym | Definition |
|---|
| IGB | Illinois Gaming Board |
| IGB | Internationaler Gewerkschaftsbund (German: International Trade Union Federation) |
| IGB | Istituto di Genetica e Biofisica (Italy) |
| IGB | Inner-German Border (former boundary/border between East and West Germany) |
| IGB | Illegal Gambling Business |
| IGB | Inlet Gearbox (gas turbines) |
| IGB | Institute & Guild of Brewing (now known as the Institute of Brewing & Distilling; UK) |
| IGB | Intermediate Gear Box |
| IGB | International Gravimetric Bureau (France) |
| IGB | (Fraunhofer) Institut für Grenzflächen- und Bioverfahrenstechnik, Stuttgart, Germany |