Jagex Limited is a British video game developer and publisher based at the Cambridge Science Park in Cambridge, England. It is best known for RuneScape and Old School RuneScape, both free-to-play massively multiplayer online role-playing games. The company's name is derived from the company's original slogan, "Java Gaming Experts".

In addition to RuneScape, Jagex has released multiple casual games on its FunOrb portal, as well as other titles. Jagex was owned by U.S. investors between 2012 and 2016, by Chinese investors from 2016 to 2020, by Macarthur Fortune Holding LLC in 2020, by The Carlyle Group from 2020 to 2024, and is presently owned by CVC Capital Partners.