HK1 (disambiguation)

HK1 is an enzyme.

HK1 or HK-1 may also refer to:


 * HK-1, the original designation of the aircraft Hughes H-4 Hercules
 * Heinonen HK-1, a Finnish sport aircraft
 * Kimura HK-1, a Japanese experimental aircraft
 * (127934) 2003 HK1, a minor planet