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HCSS may refer to:

  • Holy Cross Secondary School in Peterborough, Ontario
  • Hypercompact stellar system, a cluster of stars around a supermassive black hole
  • The file extension ".hcss" (Hyper Color Swatch Set) associated with the "Hyper Color" software application from SodaBush
  • Hardcore Superstar, a Swedish rock band.
    • HCSS (album), 2015 album by Hardcore Superstar above