| ISFA | Illinois Sports Facilities Authority 
| Others |
| ISFA | Illinois State Florist Association
| Others |
| ISFA | Independent School Foundation Academy
| Others |
| ISFA | Independent Schools Football Association
| Others |
| ISFA | Independent Schools Foundation Academy
| Others |
| ISFA | Indiana Smoke Free Alliance
| Others |
| ISFA | Intercollegiate Soccer Football Association
| Others |
| ISFA | International Salmon Farmers Association
| Others |
| ISFA | International Scientific Film Association
| Others |
| ISFA | International Society for
| Others |
| ISFA | International Society For Apheresis
| Others |
| ISFA | International String Figure Association
| Others |
| ISFA | International Student Fairs Africa
| Others |
| ISFA | International Surface Fabricators Association
| Others |