Square Enix Holdings Co., Ltd. (株式会社スクウェア・エニックス・ホールディングス Kabushiki-gaisha Sukuwea Enikkusu Hōrudingusu?) is a Japanese video game developer, publisher, and distribution company that is best known for its role-playing video game franchises, which include the Final Fantasy, Dragon Quest, and Kingdom Hearts role-playing game series. Its headquarters are located in the Shinjuku Eastside Square Building in Shinjuku, Tokyo.

The original Square Enix was formed as the result of a merger between Square and Enix. The merger occurred on April 1, 2003 with Enix as the surviving company. Each share of Square's common stock was exchanged for 0.85 shares of Enix's common stock. At the time, 80% of Square Enix staff were made up of former Square Co. employees. As part of the merger, former Square president Yoichi Wada was appointed president of the new corporation, while former Enix president Keiji Honda became its vice president. The founder of Enix, Yasuhiro Fukushima, currently serves as the honorary chairman and largest shareholder of the corporation.

The company owns Taito Corporation, best known for arcade games such as Space Invaders, Bubble Bobble and Bust-a-Move, and former game publisher Eidos Interactive, which has been absorbed into Square Enix Europe. Square Enix now publishes all of Eidos's intellectual property and runs Eidos's development studios. Eidos was most well known for publishing the Tomb_Raider, Hitman, Deus Ex, Just Cause, Legacy of Kain, and Thief series of games.