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IRB may refer to:

in organizations:

  • Immigration and Refugee Board of Canada, a Canadian administrative tribunal
  • Institut Ruđer Bošković (Ruđer Bošković Institute), a Croatian research institute
  • Institutional review board, a committee to monitor research involving humans
  • Instituto de Resseguros do Brasil, a Brazilian company of reinsurance
  • Instituto Ricardo Brennand, a museum in Recife, Brazil
  • International Rugby Board, the former name of World Rugby, the governing board of rugby union
  • IRB Infrastructure, an Indian road infrastructure company
  • Irish Republican Brotherhood, an Irish secret revolutionary society of the 19th and early 20th centuries

in technology:

  • Interactive Ruby Shell, a shell for programming in Ruby
  • ASEA IRB, an industrial robot


  • Inflatable Rescue Boat, a rubber boat with an outboard motor used in surf lifesaving
  • Internal Ratings-Based Approach (Credit Risk), an approach to estimate capital requirements by banks under the Basel II guidelines
  • Internal Revenue Bulletin, a weekly publication of the U.S. Internal Revenue Service