PSA, PsA, Psa, or psa may refer to:

TransportationEdit

BiologyEdit

ChemistryEdit

ComputingEdit

  • Professional services automation, software for automating project and billing management for professional service firms
  • PSA Certified, Platform Security Architecture, a security certification for the Internet of Things
  • Plesk Server Administrator, a commercial web hosting automation program

Contracts, legislation, and governmentEdit

OrganizationsEdit

World-wide scopeEdit

Specific to large English-speaking countriesEdit

Other country-specific organizationsEdit

Other usesEdit