Star Wars: Knights of the Old Republic (often abbreviated KOTOR or KotOR) is a role-playing video game developed by BioWare and published by LucasArts. The first installment of the Star Wars: Knights of the Old Republic series, it was released for the Xbox on July 19, 2003, and for Microsoft Windows on November 19, 2003. It was ported to Mac OS X, iOS, and Android by Aspyr, and it is playable on the Xbox 360, Xbox One, and Xbox Series X and Series S via backward compatibility. A Nintendo Switch version was released on November 11, 2021.