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IIF may refer to:

  • IIf and ?:, the inline-if computing function
  • Indirect immunofluorescence, one of several types of immunofluorescence
  • Information Interchange Format (IIF), a record serialization format specified in ISO 2709, also published as ANSI Z39.2.
  • Institute of International Finance (IIF), an association of international financial institutions
  • International Indonesia Forum (IIF), an organisation which holds annual interdisciplinary seminars in Indonesia.
  • International Institute of Forecasters (IIF), a nonprofit organization devoted to advancing the science of forecasting, and publisher of International Journal of Forecasting and Foresight: The International Journal of Applied Forecasting.
  • Intuit Interchange Format, a file format used by Intuit's Quickbooks software