Kingdom Hearts  is a series of action role-playing games developed and published by Square Enix (originally by Square). It is a collaboration between Square Enix and The Walt Disney Company and is under the leadership of Tetsuya Nomura, a longtime Square Enix employee.

Kingdom Hearts is a crossover of various Disney properties based in an original fictional universe. The series centers on the main character, Sora, and his journey and experiences with various Disney and Pixar characters, as well as some from Square Enix properties, such as Final Fantasy, The World Ends With You and Einhänder, in addition to original characters and locations created specifically for the series. The primary plotline of the series sees the protagonists clash against the multiple incarnations of Xehanort, the primary antagonist for phase 1 while phase 2 focuses on the Masters.

The series consists of thirteen games available for multiple platforms and future games are planned. Most of the games in the series have been positively received and commercially successful. As of March 2022, the Kingdom Hearts series has shipped more than 36 million copies worldwide. A wide variety of related merchandise has been released along with the games, including soundtracks, figurines, companion books, light novels, a collectible card game, and a manga series.