| Acronym | Definition |
|---|
| HPDI➣High Pressure Direct Injection |
| HPDI➣Health Products Distributors, Inc. (Oracle, AZ) |
| HPDI➣Highway Planning and Design Institute (China) |
| HPDI➣Highest Posterior Density Interval |
| HPDI➣Human Performance Development International (Romania) |
| HPDI➣Harmonic Power Doppler Imaging (medical technology) |