| Abbreviation | Definition |
|---|---|
| ISSF | International Seafood Sustainability Foundation |
| ISSF | International Space Safety Foundation |
| ITF | International Transformation Foundation |
| ITF | International Tree Foundation |
| IUF | Indiana Ultimate Foundation |
| IWCF | Idaho Women's Charitable Foundation |
| IWCF | International Workers Compensation Foundation |
| IWCF | International Workers' Compensation Foundation |
| IWF | Internet Watch Foundation |
| IYF | Iraqi Youth Foundation |
| JAAF | Japan America Artist Foundation |
| JAF | Joe Andruzzi Foundation |
| JAFB | Journalist Alliance Foundation of Bangladesh |
| JAFI | Jefferson Alcoholic Foundation Inc |
| JAKF | John A Kufour Foundation |
| JAKF | John A Kufuor Foundation |
| JATF | JITO Administrative Training Foundation |
| JBCF | J Bulow Campbell Foundation |
| JBFC | Janada L Batchelor Foundation for Children |
| JBFF | James Brown Family Foundation |