Kingdom Hearts is a series of action role-playing games developed and published by Square Enix (formerly Square). It is the result of a collaboration between Square Enix and Disney Interactive Studios. Kingdom Hearts is a crossover of various Disney settings based in a universe made specifically for the series. The series features a mixture of familiar Disney and Final Fantasy characters, as well as several new characters designed by Tetsuya Nomura. In addition, it has an all-star voice cast which includes many of the Disney characters' official voice actors.

The series centers on Sora's search for his friends and his encounters with various Disney and Final Fantasy characters along the way. Players primarily control Sora, though there are numerous characters that join Sora's party as computer controlled members. The majority of the characters were introduced in the first game Kingdom Hearts. Subsequent installments feature several new original, Disney and Final Fantasy characters and Kingdom Hearts 3D: Dream Drop Distance introduces several characters from Square Enix's The World Ends With You.

Kingdom Hearts (キングダム ハーツ, Kingudamu Hātsu^?) is a series of action role-playing games developed and published by Square Enix. It is a collaboration between Square Enix and Disney Interactive Studios, 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 features an all-star voice cast, which includes many of the Disney characters' official voice actors and well-known actors such as Haley Joel Osment, David Gallagher, and Hayden Panettiere. Characters from Square Enix's Final Fantasy series make appearances and interact with the player and the Disney characters. The series centers on the main character Sora's search for his friends and his encounters with Disney and Final Fantasy characters on their worlds.

The series currently consists of seven games across multiple video game consoles, and future titles are planned. Most of the games in the series have been both critically acclaimed and commercially successful, though each title has seen varying levels of success. As of March 2011, the Kingdom Hearts series has sold over 17 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.