PSK may refer to:

Businesses and organisations

  • Österreichische Postsparkasse (PSK), a former postal savings bank in Austria
  • Phi Sigma Kappa, a men's social and academic fraternity in North America
  • Post Südstadt Karlsruhe, a German sports club
  • Revolutionary Party of Kurdistan (Partiya Şoreşa Kurdistan, PŞK), an illegal political party active in Turkey

Science and technology

  • Phase-shift keying, a digital modulation process
  • Polysaccharide-K, a protein-bound polysaccharide
  • Pre-shared key, a shared secret in cryptography

Other uses

  • "P.S.K. What Does It Mean?", a 1985 song by Schoolly D
  • P. S. K. Paha (fl. 1978), Ghanaian footballer and manager