Kingdom Hearts (Japanese: キングダム ハーツ Hepburn: Kingudamu Hātsu) is a series of crossover action role-playing gamesowned by Disney Interactive Studios and developed and published by Square Enix (originally by Square). It is a collaboration between Disney Interactive and Square Enix, and is under the direction of Tetsuya Nomura, a longtime Square Enix character designer.

Kingdom Hearts is a crossover of various Disney settings based in a universe made specifically for the series. The series primarily centers on the main character Sora and his journey and experiences with various Disney, Final FantasyThe World Ends with You and Pixar characters, whilst stopping the various incarnations of the primary antagonist Xehanort throughout the series. All characters original to the Kingdom Hearts franchise are owned by The Walt Disney Company.

The series consists of nine games across multiple platforms, and future titles are planned. Most of the games in the series have been both positively received and commercially successful. As of October 2013, the Kingdom Hearts series has sold more than 25 million copies worldwide. A wide variety of related merchandise has been released along with the games, including soundtracks, figurines, companion books, novels and manga series.