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IAB may refer to:

  • Internet Architecture Board, Internet Society committee
  • McConnell Air Force Base, Wichita, Kansas, US, IATA airport code
  • Individual Address Block in computer networking
  • International Association of Book-keepers
  • International Association of Bryologists
  • Interactive Advertising Bureau, an organization that develops industry standards, conducts research, and provides legal support for the online advertising industry
  • Internet Advertising Bureau UK,IAB UK, a trade association
  • International Accounting Bulletin, an UK accountancy publication
  • Israel Association of Baseball, governing body of baseball in Israel

The letter designation IAB may refer to:

  • IAB meteorites