IAB

IAB may refer to:

Organisations

• Institute of Architects Bangladesh, a professional organisation for architects in Bangladesh
• Interactive Advertising Bureau, an organization that develops industry standards, conducts research, and provides legal support for the online advertising industry
• Internal Affairs Bureau of the New York City Police Department
• International Agrarian Bureau, or "Green International"
• International Association of Book-keepers, UK
• International Association of Bryologists, the study of mosses, liverworts, and hornworts
• Internet Advertising Bureau, UK trade association
• Internet Architecture Board, Internet Society committee
• Israel Association of Baseball

Air force bases

• Isa Air Base, Bahrain
• McConnell Air Force Base (IATA airport code), Wichita, Kansas, US

Other uses

• IAB meteorite
• International Accounting Bulletin, a UK accountancy publication
• Individual Address Block, in computer networking
• Internal Affairs Bureau, part of the New York City Police Department