| Acronym | Definition |
|---|
| IDDI➣Infrared Difference Dust Index (climatology product) |
| IDDI➣International Drug Development Institute |
| IDDI➣Illicit Drug Diversion Initiative (Australian Institute of Health and Welfare) |
| IDDI➣Institute for Developmental Disabilities, Inc. (Assonet, MA) |
| IDDI➣Instituto de Desarrollo Integral (Spanish: Institute for Integrated Development; California) |