Unknown (disambiguation)

The term Unknown may refer to a number of things in the Kingdom Hearts series.
 * Xemnas in Kingdom Hearts Final Mix
 * Marluxia in Kingdom Hearts: Chain of Memories
 * Riku in Kingdom Hearts II
 * Riku or Xion in Kingdom Hearts 358/2 Days
 * The Unknown in Kingdom Hearts Birth by Sleep
 * Data Roxas in Kingdom Hearts coded