| 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) |