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HCD may stand for:

  • Higher-energy collisional dissociation, an ion fragmentation technique
  • Hectocandela, an SI unit of luminous intensity equal to 100 candelas
  • Host controller driver, a host controller interface
  • HCD Research, developers of MediaCurves
  • The Swiss ice hockey club HC Davos
  • The California state agency, the California Department of Housing and Community Development