LPSI
| Acronym | Definition |
|---|---|
| LPSI | Low Pressure Safety Injection (nuclear power) |
| LPSI | Livestock and Poultry Sciences Institute (USDA) |
| LPSI | La Piccola Scuola Italiana (Italian: Little Italian School; San Francisco, CA) |
| LPSI | lights per square inch |
| LPSI | Liberty Payment Services Inc. |
| LPSI | Loss Prevention Systems, Inc. (Kennesaw, GA) |
| LPSI | Laboratoire de Physique des Surfaces et Interfaces (French: Laboratory of the Physics of Surfaces and Interfaces; Belgium) |