| Acronym | Definition |
|---|
| IAB | Interactive Advertising Bureau |
| IAB | Internet Architecture Board |
| IAB | Internet Advertising Bureau |
| IAB | Institut für Arbeitsmarkt- und Berufsforschung (German: Federal Institute for Job Research) |
| IAB | Internet Activities Board |
| IAB | Industrial Advisory Board |
| IAB | Institute of Arctic Biology (University of Alaska Fairbanks) |
| IAB | Interagency Board (Equipment Standardization and InterOperability) |
| IAB | I Am Bored |
| IAB | Irish Agrément Board (National Standards Authority of Ireland) |
| IAB | International Association of Book-Keepers |
| IAB | Instituto dos Arquitetos do Brasil (Brazil) |
| IAB | Internal Affairs Bureau |
| IAB | Internet Advisory Board |
| IAB | International Association of Bioethics |
| IAB | Interagency Advisory Board |
| IAB | I Am Back |
| IAB | McConnell AFB (Airport Code) |
| IAB | International Arrivals Building (airports) |
| IAB | International Association of Broadcasting |
| IAB | Internet Advertising Board |
| IAB | Investment Approvals Board (UK MOD) |
| IAB | Island-Arc Basalt (earth science) |
| IAB | Internet Audio Broadcasting (One-way audio option for webconferencing) |
| IAB | Individual Address Block |
| IAB | Intake Air Bypass |
| IAB | Interagency Airtanker Board (National Interagency Aviation Council) |
| IAB | International Abstracting Board |
| IAB | Information Assurance Bulletins |
| IAB | Internetwork Architecture Board |
| IAB | It's All Bollocks (UK slang) |