| Acronym | Definition |
|---|
| HRDI➣High Range Dynamic Image |
| HRDI➣High Resolution Doppler Imager |
| HRDI➣Human Resource Development International (UK) |
| HRDI➣Human Resources Development Institute, Inc (Chicago, IL behavioral health organization) |
| HRDI➣Healthcare Research and Development Institute (Pensacola, Florida) |
| HRDI➣Hycroft Resources and Development Inc. |
| HRDI➣Haleakala Research and Development, Inc. (plasma antennas; Brookfield, MA) |