| Acronym | Definition |
|---|
| PiS➣Law and Justice (Poland) |
| PiS➣Programa de Integração Social (Social Integration Program, Brazil) |
| PiS➣Pigs in Space (band) |
| PiS➣Postal Inspection Service (US) |
| PiS➣Passenger Information System |
| PiS➣Patient Information Sheet (drug trials) |
| PiS➣Portfolio Investment Scheme (finance; various companies) |
| PiS➣Product Information Sheet |
| PiS➣Protocol Interfaces |
| PiS➣Project Implementation Schedule |
| PiS➣Processing Information Structure |
| PiS➣Physical Interfaces |
| PiS➣Pharmacy Information System |
| PiS➣Production Information System (data processing network) |
| PiS➣Pre-Installation Survey |
| PiS➣Personnel Identification System |
| PiS➣Public Information Specialist |
| PiS➣Polarized Ion Source (accelerator technology) |
| PiS➣Private Independent School |
| PiS➣Polish Intelligence Service |
| PiS➣Process Improvement Specialist |
| PiS➣Privacy-Invasive Software |
| PiS➣Plot Induced Stupidity |
| PiS➣Prawo i Sprawiedliwoœæ (Law and Justice; Polish political party) |
| PiS➣Pompano Indoor Skatepark (Florida) |
| PiS➣Politiets IndsatsStyrke (Danish TV show) |
| PiS➣Post Implementation Support |
| PiS➣Pisidic (linguistics) |
| PiS➣PLC Information System |
| PiS➣Pressure Indicating Switch |
| PiS➣Pacific Insular States |
| PiS➣Public Information Services Ltd (UK) |
| PiS➣Power Interface Systems (BSMC Power Nigeria Ltd.) |