| Abbreviation | Definition |
|---|---|
| ICUF | Iowa Credit Union Foundation |
| ICUF | Ireland Canada University Foundation |
| IDCF | Interior Designers of Canada Foundation |
| IDDF | International Diploma in Degree Foundation |
| IDDF | Isadora Duncan Dance Foundation |
| IDF | Indian Development Foundation |
| IDF | Innovative Digital Foundations |
| IDF | Interaction Design Foundation |
| IDF | International DOI Foundation |
| IDF | International Dominican Foundation |
| IDFA | Immune Deficiencies Foundation Australia |
| IDFI | Iloilo Dinagyang Foundation Incorporated |
| IDKF | Indonesian diatrans kidney foundation |
| IDRF | India Diabetes Research Foundation |
| IEF | Indigenous Education Foundation |
| IEF | International Egg Foundation |
| IEF | International Elephant Foundation |
| IEF | International Eye Foundation |
| IEF | Inuvialuit Education Foundation |
| IEFF | International Elephant Film Foundation |