Star Wars: Knights of the Old Republic (KOTOR) is a media franchise of space opera role-playing video games created and developed by BioWare, which have seen releases on the original Xbox, Microsoft Windows, OS X, Xbox One, Xbox Series X/S, IOS, Android and Nintendo Switch. The franchise takes place in the fictional universe of Star Wars by George Lucas.

The first title, and subsequent massively multiplayer online role-playing game series, was developed by BioWare while the second was done by Obsidian Entertainment per LucasArts' request. All were published by LucasArts. The video game series is based on an earlier comic book series; the franchise includes a subsequent new comic book series. Both comic series were published by Dark Horse Comics and act as prequels to the video games.