| Acronym | Definition |
|---|
| PSSI | Prague Security Studies Institute (Czech Republic) |
| PSSI | Public Safety Solutions, Inc. (Chicago, IL) |
| PSSI | Phosphorus, Sulfur and Silicon |
| PSSI | Peninsula Sanitary Service, Inc. (Stanford, CA) |
| PSSI | Puget Sound Sailing Institute (Washington) |
| PSSI | Persatuan Sepak Bola Seluruh Indonesia (Football Association of Indonesia) |
| PSSI | Performance Salary Step Increase |
| PSSI | Perforated Screen Surfaces Incorporated (Conklin, NY) |
| PSSI | Powertech Substation Services, Inc. (Manila, Philippines) |
| PSSI | Primary Specialty Skill Identifier |