| PAIS | Pa Adelanto i Inovashon Soshal 
| Others |
| PAIS | PAN Asia International School
| Others |
| PAIS | Panasonic Automotive and Industrial Systems
| Others |
| PAIS | Partial Androgen Insensitivity Syndrome
| Others |
| PAIS | Path Alarm Indication Signal
| Others |
| PAIS | Path Alarm Indicator Signal
| Others |
| PAIS | Patient Active Inactive Status
| Others |
| PAIS | Patria Altiva I Soberana
| Others |
| PAIS | Pennsylvania Association of Independent Schools
| Others |
| PAIS | People-Carrier Automotive Investment Scheme
| Others |
| PAIS | Personal Accident Insurance Schism
| Others |
| PAIS | Photo Acoustic Infrared Spectroscopy
| Others |
| PAIS | Physicians Appointment Information System
| Others |
| PAIS | Politics and International Studies
| Others |
| PAIS | Practice Accreditation And Improvement Survey
| Others |
| PAIS | Prestigious Applications Of Intelligent Systems
| Others |
| PAIS | Primary Androgen Insensitivity Syndrome
| Others |
| PAIS | Psychological Adjustment To Illness Scale
| Others |
| PAIS | Public Access Internet Site
| Others |
| PAIS | Public Affairs and Information Staff
| Others |
| PAIS | Public Affairs Information Service
| Others |