IMB is a three-letter abbreviation that may refer to:
Organizations IMB Bank, an Australian banking institution IMB Financial Services, a South African banking services institution Indymac Bancorp, former NYSE symbol Institute of Molecular Biology in Mainz, Germany The International Maritime Bureau of the International Chamber of Commerce The International Mission Board of the Southern Baptist Convention
Other Independent Monitoring Board, of the conditions of prisoners in English jails Integrated Media Block in digital cinema Integrated Mobile Broadcast of TV over mobile telephony Intelligent Mail Barcode, a barcode used on mail in the United States Intermenstrual bleeding, uterine bleeding between the expected menstrual periods Internal Market Bill, United Kingdom, proposals for trading mechanisms within the UK The Irvine-Michigan-Brookhaven detector, of neutrinos, Ohio, US