H&K

H&K can refer to:

• Heckler & Koch, a German weapons manufacturing company
• Hughes & Kettner, a German brand of guitar and bass amplifiers, cabinets and effects processors
• Harold & Kumar, a series of stoner comedies and its titular characters
  • Harold & Kumar Go to White Castle, a 2004 film
  • Harold & Kumar Escape from Guantanamo Bay, its sequel
• Eric Harris and Dylan Klebold, American mass murder duo
• Hampstead and Kilburn, a UK parliament constituency
• The Calcium H and K lines, a pair of violet spectral lines
• "H-K (Hunter-Killer)", song by Fear Factory from the album Demanufacture, 1995