Castle Key

Castle Key may refer to:
 * Castle Key 1 and Castle Key 2, two related items in Super Mario RPG: Legend of the Seven Stars.
 * Castle Key, a group of similarly-named items in Tubba Blubba's Castle in Paper Mario.
 * Castle Key, a group of similarly-named items in Peach's Castle in Paper Mario.
 * Castle Key, a group of similarly-named items in Bowser's Castle in Paper Mario.
 * Castle Key, a group of similarly-named items in Paper Mario: The Thousand-Year Door.