| Acronym | Definition |
|---|
| ISF➣International Softball Federation |
| ISF➣Internal Security Forces (Lebanon) |
| ISF➣Importer Security Filing |
| ISF➣Impôt de Solidarité sur la Fortune (French: wealth tax) |
| ISF➣Imaging Science Foundation |
| ISF➣Ian Somerhalder Foundation (est. 2010) |
| ISF➣Ingegneria Senza Frontiere (Italian: Engineers without Borders) |
| ISF➣International Seed Federation (Switzerland) |
| ISF➣Internal Service Fund (various organizations) |
| ISF➣Informatici Senza Frontiere (Italian: Computers Without Borders) |
| ISF➣Information Security Framework (various companies) |
| ISF➣Information Security Forum (est. 1989) |
| ISF➣Indexed Sequential File |
| ISF➣Internet Security Framework |
| ISF➣Incoming Signal Failure |
| ISF➣Inter System Facilities |
| ISF➣International Shipping Federation |
| ISF➣Iraqi Security Force |
| ISF➣Indian Staffing Federation (employment) |
| ISF➣Institute for Sustainable Futures (Sydney, Australia) |
| ISF➣Interstitial Fluid |
| ISF➣Insofar |
| ISF➣Illinois Service Federal (banking) |
| ISF➣Initiative Sozialistisches Forum (German: Socialist Initiative Forum) |
| ISF➣International Science Foundation |
| ISF➣Israeli Special Forces |
| ISF➣Insufficient Funds |
| ISF➣India Social Forum (World Social Forum) |
| ISF➣International Ski Federation |
| ISF➣Institutt for Samfunnsmedisinske Fag (Norwegian: Department of Public Health) |
| ISF➣Iowa State Fair |
| ISF➣Information Systems Frontiers |
| ISF➣International Sepsis Forum |
| ISF➣Indian State Forces |
| ISF➣International Snowboarding Federation |
| ISF➣I Sådana Fall |
| ISF➣Ingenieros Sin Fronteras (Spanish: Engineers Without Borders) |
| ISF➣Integrated Social Forestry (Philippines) |
| ISF➣International Song Festival |
| ISF➣Industry Super Fund (Australia) |
| ISF➣International Shinto Foundation |
| ISF➣Information Security Foundation |
| ISF➣Islamic Salvation Front |
| ISF➣Industrial Space Facility |
| ISF➣Imperial Smelting Furnace |
| ISF➣Information Strike Force (Navy/Marine Corp Intranet; NMCI) |
| ISF➣Interscholastic Surfing Federation (Carlsbad, CA) |
| ISF➣Integrated Support Facility |
| ISF➣Individual Share Future (finance) |
| ISF➣Integrative Strategies Forum |
| ISF➣International School Frankfurt |
| ISF➣Information Systems Forum |
| ISF➣Ingénierie Sans Frontières (French: Engineering Withouth Borders; Sherbrooke, Québec, Canada) |
| ISF➣Industrial Share Fund |
| ISF➣Investigator Site File |
| ISF➣Ingénierie Sans Frontières (Engineers Without Borders) |
| ISF➣Imperial Special Forces (gaming) |
| ISF➣Institute of Soil Fertility (Netherlands) |
| ISF➣Investigative Support & Forensics |
| ISF➣International Society of Financiers, Inc. |
| ISF➣Integration Support Facility |
| ISF➣Import Service Fee |
| ISF➣In Service Failure |
| ISF➣Indian Standard Flat |
| ISF➣Intelligence Support Facility |
| ISF➣Integrated Support-Fielding |
| ISF➣Infrastructure Support Facilities |
| ISF➣Income Stabilization Fund |