IAB
- IAB meteorite
- Individual Address Block
- Institute of Accountants and Bookkeepers
- Institute of Architects Bangladesh
- Interactive Advertising Bureau
- Internal Affairs Bureau
- International Accounting Bulletin
- International Agrarian Bureau
- International Association of Bryologists
- Internet Advertising Bureau
- Internet Architecture Board
- Isa Air Base
- Islami Andolan Bangladesh
- Israel Association of Baseball
- McConnell Air Force Base