| ISF | I Sell Fitness 
| Others |
| ISF | I Simply Forgot
| Others |
| ISF | Ian Somerhalder Foundation
| Others |
| ISF | IASPEI Seismic Format
| Others |
| ISF | Illinois Shakespeare Festival
| Others |
| ISF | Imaging Science Foundation
| Others |
| ISF | Immigration Services Funding
| Others |
| ISF | Imperial Strike Force
| Others |
| ISF | Import Security Filing
| Others |
| ISF | Import Service Fee
| Others |
| ISF | Importer Security Filing
| Others |
| ISF | Importer Security Filling
| Others |
| ISF | In So Far
| Others |
| ISF | Inclusive Sports and Fitness
| Others |
| ISF | Incoming Signal Failure
| Others |
| ISF | Indexed Sequential File
| Others |
| ISF | IndoChina Starfish Foundation
| Others |
| ISF | Indochina Starfishfish Foundation
| Others |
| ISF | Industrial Space Facility
| Others |
| ISF | Infinate Shape Feature
| Others |
| ISF | Infinite Shape Feature
| Others |
| ISF | Information Security Forum
| Others |
| ISF | Information Strike Force
| Others |
| ISF | Information Systems Frontiers
| Others |
| ISF | Information Systems of Florida
| Others |
| ISF | Infotainment Specification Format
| Others |
| ISF | Infra Slow Fluctuation
| Others |
| ISF | Infra Slow Fluctuations
| Others |
| ISF | Initial Submittable File
| Others |
| ISF | Initiative for Smallholder Finance
| Others |
| ISF | Ink Serialized Format
| Others |
| ISF | Input Serialized Format
| Others |
| ISF | Insaf Student Federation
| Others |
| ISF | Institute for a Sustainable Future
| Others |
| ISF | Institute for Spiritual Formation
| Others |
| ISF | Institute for Sustainable Futures
| Others |
| ISF | Instrument Safety Factor
| Others |
| ISF | Insulin Safety Factor
| Others |
| ISF | Insuresilience Solutions Fund
| Others |
| ISF | Integrated Semantic Framework
| Others |
| ISF | Integrated Support-Fielding
| Others |
| ISF | Integrative Strategies Forum
| Others |
| ISF | Intelligent Seat Fold
| Others |
| ISF | Intelligent Sensing Framework
| Others |
| ISF | Intelligent Strong And Fast
| Others |
| ISF | Inter System Facilities
| Others |
| ISF | Interactive Shader Format
| Others |
| ISF | Interconnected Systems Framework
| Others |
| ISF | Interdisciplinary Studies Field
| Others |
| ISF | Intermediate Sanction Facilities
| Others |
| ISF | Intermediate Sanctions Facility
| Others |
| ISF | Internal Security Force
| Others |
| ISF | Internal Security Forces
| Others |
| ISF | Internal Security Fund
| Others |
| ISF | International School Frankfurt
| Others |
| ISF | International School of Florence
| Others |
| ISF | International Security Foundation
| Others |
| ISF | International Seed Federation
| Others |
| ISF | International Selection Fund
| Others |
| ISF | International Sepsis Forum
| Others |
| ISF | International Service Fund
| Others |
| ISF | International Shipping Federation
| Others |
| ISF | International Shooters Force
| Others |
| ISF | International Skateboarding Federation
| Others |
| ISF | International Skyrunning Federation
| Others |
| ISF | International Snowboard Federation
| Others |
| ISF | International Softball Federation
| Others |
| ISF | International Space Forum
| Others |
| ISF | International Sports Federation
| Others |
| ISF | International Student Foundation
| Others |
| ISF | International Student Friendship
| Others |
| ISF | International Students Festival
| Others |
| ISF | International Symposium on Forecasting
| Others |
| ISF | Internationale Schule Frankfurt
| Others |
| ISF | Internet Sans Frontieres
| Others |
| ISF | Internet Security Framework
| Others |
| ISF | Internet Signal Failure
| Others |
| ISF | Internet Social Forum
| Others |
| ISF | Internet Society Foundation
| Others |
| ISF | Introduction To Structure And Function
| Others |
| ISF | Inverse Square Factor
| Others |
| ISF | Inverse Syndrome Former
| Others |
| ISF | Investigator Site File
| Others |
| ISF | Iraqi Security Forces
| Others |
| ISF | Iraqi Special Forces
| Others |
| ISF | Iron Spring Farm
| Others |
| ISF | Irrigation Service Fee
| Others |
| ISF | Is Short For
| Others |
| ISF | Islamic Scholarship Fund
| Others |
| ISF | Islander Sports Foundation
| Others |
| ISF | Israel Science Foundation
| Others |
| ISF | The Information Security Forum
| Others |
| ISF | The International Shintaido Federation
| Others |