ISF

• Idaho Shakespeare Festival
• Importer Security Filing
• Incremental sheet forming
• Independent Schools Foundation Academy
• Information Security Forum
• Ingenieurs Sans Frontieres
• Ink Serialized Format
• Internal Security Forces
• International School Sport Federation
• International School of Florence
• International Seafarers' Federation
• International Skyrunning Federation
• International Snowboard Federation
• International Socca Federation
• International Softball Federation
• Internationale Schule Frankfurt Rhein-Main
• Interstitial fluid
• Iraqi security forces
• Italian Strategic Fund
• Lexus IS F
• Pakistan Tehreek-e-Insaf
• Solidarity tax on wealth
• The Idries Shah Foundation
• Video calibration software
• Île Sans Fil