title: HK1 (disambiguation)
text: # 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
  