IAB

IAB may refer to:

• Islami Andolan Bangladesh, Political party of Bangladesh.
• Internal affairs (law enforcement) (Internal Affairs Bureau)
• Internet Architecture Board, committee charged with oversight of the technical and engineering development of the Internet by the Internet Society
• McConnell Air Force Base, Wichita, Kansas, United States, IATA airport code
• Individual Address Block (computers and computer networking)
• Infantry Assault Badge, German war badge awarded to Waffen SS and Wehrmacht Heer soldiers during WWII
• International Association of Book-keepers, a professional organization for bookkeepers
• International Association of Bryologists, a professional organization for bryologists
• Interactive Advertising Bureau, advertising business organization that develops industry standards, conducts research, and provides legal support for the online advertising industry
• Internet Advertising Bureau, a global collection of trade associations for digital advertising
• International Accounting Bulletin, an UK accounting publication focusing on global issues
• [[#REDIRECT Israel Association of Baseball, the governing body of baseball in Israel

The letter designation IAB may refer to:

• IAB meteorites