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

• 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)

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