| PSIA | Palm Springs International Airport 
| Others |
| PSIA | Paris School of International Affairs
| Others |
| PSIA | Patient Specific Investigative Analysis
| Others |
| PSIA | Penn State Investment Association
| Others |
| PSIA | Philippine Software Industry Association
| Others |
| PSIA | Physical Security Interoperability Alliance
| Others |
| PSIA | Pounds per Square Inch Absolute/Atmosphere
| Others |
| PSIA | Pounds per Square Inch, Absolute
| Others |
| PSIA | Poverty and Social Impact Analysis
| Others |
| PSIA | Private Schools Interscholastic Association
| Others |
| PSIA | Professional Ski Instructors of America
| Others |
| PSIA | Profit Sharing Investment Account
| Others |
| PSIA | Public Safety Information Act, 1997
| Others |
| PSIA | Public Security Intelligence Agency
| Others |
| PSIA | Public Security Investigation Agency
| Others |