Master key

Master key may refer to:

• Master keying, a special type of key designed to open multiple locks
• Master Key, a pricing game on The Price Is Right
• Knight's Armament Company Masterkey, a door breaching shotgun
• One of the encryption keys used in a Master/Session encryption scheme
• Master Key (TV series), a South Korean variety show
• Master Key (Video Game) an independent video game by developer Achromi