| Acronym | Definition |
|---|
| PSIA | Pounds per Square Inch Absolute |
| PSIA | Professional Ski Instructors of America |
| PSIA | Paris School of International Affairs |
| PSIA | Political Science and International Affairs (various schools) |
| PSIA | Profit Sharing Investment Account (finance) |
| PSIA | Program for Science and International Affairs (various schools) |
| PSIA | Pounds per Square Inch Atmosphere |
| PSIA | Public Security Investigation Agency (Japan) |
| PSIA | Poverty and Social Impact Analyses (International Monetary Fund) |
| PSIA | Private Schools Interscholastic Association (Grapevine, TX) |
| PSIA | Public Safety Information Act |
| PSIA | Position Specific Isotope Analysis |