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ISF may stand for:

  • Idaho Shakespeare Festival, theater company
  • Idries Shah Foundation, educational charity
  • Île Sans Fil, a community wireless network based in Montreal, Canada
  • Importer Security Filing
  • Impôt de Solidarité sur la Fortune, a French wealth tax
  • Incremental sheet forming
  • Information Security Forum, an international information security best practices organization
  • Ingenieurs Sans Frontieres (Engineers Without Borders)
  • Ink Serialized Format, a vector image file format from Microsoft
  • Insaf Student Federation (ISF), it is the largest Center-Left Student organization in the Nation and the official student wing of the Pakistan Tehreek-e-Insaf political party
  • Institut für Schweißtechnik und Fügetechnik der RWTH Aachen (Joining and Welding Institute of the RWTH Aachen) in Aachen, Germany
  • Internal Security Forces, of Lebanon
  • International School of Florence
  • International School Sport Federation, sports governing body for high school sport
  • International Snowboard Federation
  • International Softball Federation
  • Internationale Schule Frankfurt Rhein-Main
  • Interstitial fluid
  • Iraqi security forces
  • Lexus IS F
  • Italian Strategic Fund