| Acronym | Definition |
|---|
| HDDI➣Hierarchical Distributed Dynamic Indexing (computing) |
| HDDI➣Hialeah-Dade Development, Inc. (economic development; Florida) |
| HDDI➣Host Document Data Interchange |
| HDDI➣Hot Diluted Diffusion Ignition (combustion technology) |
| HDDI➣Hrvatsko Društvo za Dentalnu Implantologiju (Croatian Society of Dental Implantology) |