Key Hole (KH) is the designation for a series of American optical reconnaissance satellitess:

• KH-1 Corona

• KH-2 Corona

• KH-3 Corona

• KH-4 Corona

• KH-5 Argon

• KH-6 Lanyard

• KH-7 Gambit

• KH-8 Gambit 3

• KH-9 Hexagon/Big Bird

• KH-10 Dorian/Manned Orbiting Laboratory

• KH-11 Crystal/Kennan

• KH-12 Improved Crystal/Ikon/Advanced Kennan

• KH-13 (unofficial designation, sometimes applied to Enhanced Imaging System or Misty)