Eidos Interactive Ltd.  was a British software technology developer and video game publisher, now operating as Square Enix Europe. The company was headquartered in the Wimbledon Bridge House in Wimbledon, London Borough of Merton. The company has had offices all around the world, including the United States, Canada, Germany, France, Australia and Japan.

Prior to its best known games, Eidos developed full motion video (FMV) compression techniques on platforms such as the RISC OS computers of the early 1990s. Its best-known game series include Tomb Raider, Hitman, Commandos, and Deus Ex. Eidos became part of Square Enix on 22 April 2009. Following a reorganization of the company, Eidos was merged with Square Enix's European operations into Square Enix Europe. The Eidos brand currently lives only through the development studio Eidos Montréal, and is also used as a label for games developed by former Eidos-owned developers like Crystal Dynamics and IO Interactive released before take-over by Square Enix Europe.