Unknown (disambiguation)

The terms Unknown (謎の男) or ??? may refer to several things in the Kingdom Hearts series.
 * One of several characters:
 *     in Kingdom Hearts Final Mix.
 *     in Kingdom Hearts Chain of Memories.
 *     in Kingdom Hearts II and Kingdom Hearts 358/2 Days.
 *     in Kingdom Hearts 358/2 Days.
 *     in Kingdom Hearts coded.
 *     in Kingdom Hearts Birth by Sleep and Kingdom Hearts 3D: Dream Drop Distance.
 * Luxu in Kingdom Hearts Union χ.
 * The Master of Masters in Kingdom Hearts Union χ and Kingdom Hearts III.
 * Ephemer in Kingdom Hearts III.
 * The musical composition featured in Kingdom Hearts Concert -First Breath-.
 * The chapter in the Kingdom Hearts manga.