PSIA

PSIA or psia may refer to:


 * Physical Security Interoperability Alliance, industrial standardization initiative promoting interoperability of IP-enabled security devices
 * Pounds per square inch absolute (including atmospheric pressure)
 * Professional Ski Instructors of America, an organization offering training and certification for U.S. Ski Instructors
 * Philippine Software Industry Association
 * Paris School of International Affairs
 * Private Schools Interscholastic Association
 * Palm Springs International Airport
 * Public Security Intelligence Agency, the national intelligence agency of Japan