PESI
| Acronym | Definition |
|---|---|
| PESI | Perma-Fix Environmental Services, Inc |
| PESI | Professional Education Systems, Inc. (Eau Claire, WI) |
| PESI | Professional Education Systems Institute (Eau Claire, WI) |
| PESI | Pizza Equipment Supply, Inc |
| PESI | Prime Electronics & Satellitics, Inc. (Taiwan) |
| PESI | Pipeline Engineering Solutions, Inc. |