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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
  • Public Security Intelligence Agency
  • Philippine Software Industry Association
  • Paris School of International Affairs