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GSK could refer to:

  • Galatasaray S.K., a Turkish sports club based in Istanbul
  • GlaxoSmithKline (stock symbol "GSK"), a multinational pharmaceutical corporation
  • Global Security Kit (GSKit), programming libraries and utilities from IBM for Transport Layer Security
  • GSK-3, a protein kinase that regulates cell proliferation, differentiation and apoptosis, as well as embryonic development
  • GTK+ Scene Graph Kit