| Acronym | Definition |
|---|
| ISFF➣International Short Film Festival |
| ISFF➣International Student Film Festival |
| ISFF➣Iraqi Security Forces Fund |
| ISFF➣International Science Film Festival |
| ISFF➣Integrated Surface Flux Facility |
| ISFF➣Intergraph Standard File Format |
| ISFF➣International Student Football Federation |
| ISFF➣International Science Fiction Federation |
| ISFF➣Irina Slutskaya Fan Forum |
| ISFF➣Incredibly Strange Film Festival |
| ISFF➣Independent School Fees Fund (UK) |
| ISFF➣Idaho Spent Fuel Facility |
| ISFF➣International Surrealist Film Festival |
| ISFF➣Interior Structural Firefighter |
| ISFF➣ICSI Speech File Format |
| ISFF➣Inspector of Salmon and Freshwater Fisheries (UK) |
| ISFF➣International Sahara Film Festival |