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