| Abbreviation | Definition |
|---|---|
| IAFBC | Investment Agriculture Foundation of British Columbia |
| IAFD | International Association of Foundation Drilling |
| IAFI | ITU APT Foundation of India |
| IAWF | Iranian American Women Foundation |
| IBF | International Basketball Foundation |
| IBF | International Biocentric Foundation |
| IBF | International Breathwork Foundation |
| IBF | Islami Bank Foundation |
| IBF | Italian Benevolent Foundation |
| IBSF | Ishahayi Beach School Foundation |
| IBX | Inner Banks (Foundation of Renewal for Eastern North Carolina) |
| ICAF | International Capoeira Angola Foundation |
| ICCF | Ionia County Community Foundation |
| ICCF | Iosco County Community Foundation |
| ICEF | Illinois Chemical Education Foundation |
| ICEF | Inner City Education Foundation |
| ICF | Insomnia Clients Foundation |
| ICOF | Iowa Council of Foundations |
| ICPRF | Illinois Conservation Park and Recreation Foundation |
| ICRF | Independent Cancer Research Foundation |