| Acronym | Definition |
|---|
| IPSS | National Institute of Population and Social Security Research (Japan) |
| IPSS | International Prostate Symptom Score |
| IPSS | International Prognostic Scoring System |
| IPSS | Instituição Particular de Solidariedade Social (Portugese: Private Social Solidarity Institution) |
| IPSS | International Professional Service Semester (Monterey Institute of International Studies; Monterey, CA) |
| IPSS | Inferior Petrosal Sinus Sampling |
| IPSS | International Pilot Study of Schizophrenia |
| IPSS | Image Processing Subsystem |
| IPSS | Initial Preplanned Supply Support |
| IPSS | International Packet Switching System (ITU-T) |
| IPSS | Integrated Patent Search System |
| IPSS | In-Plane Shear Strength |
| IPSS | Internet Protocol Security Services (Sprint) |
| IPSS | Internet Protocol Service Switch (Spring Tides) |
| IPSS | Improved Pesticide Spray System |