Creative Business Unit IV (第四開発事業本部, Dai Yon Kaihatsu Jigyō Honbu?) is an internal development division within Square Enix. Formed from the merger of Business Divisions 8, 9 and 10, Creative Business Unit IV focuses on mobile and browser-based titles, as well as the Mana series, remasters and remakes, and other original titles.

It was managed by Hirokazu Nishikado until Kei Hirono took over sometime in 2022.