| PSIS | Pailan School of International Studies 
| Others |
| PSIS | Passenger Side Impact Sensor
| Others |
| PSIS | Persatuan Sepak Bola Indonesia Semarang
| Others |
| PSIS | Personal Spine Information Service
| Others |
| PSIS | Pesticide Safety Information Series
| Others |
| PSIS | Philippine Society for Industrial Security
| Others |
| PSIS | Plastic Surgery Information System
| Others |
| PSIS | Poison Substance Information System
| Others |
| PSIS | Population and Social Integration Section
| Others |
| PSIS | Posterior Superior Iliac Spine
| Others |
| PSIS | Postero-Superior Iliac Spine
| Others |
| PSIS | Postsecondary Student Information System
| Others |
| PSIS | Pounds per Square Inch Sealed
| Others |
| PSIS | Pre Safe Impulse Side
| Others |
| PSIS | Preparatory School for International Students
| Others |
| PSIS | Pressure Side Impact Sensor
| Others |
| PSIS | Private Security and Intelligence Service
| Others |
| PSIS | Product Safety Information System
| Others |
| PSIS | Programme for Strategic and International Security
| Others |