Studio BentStuff (スタジオベントスタッフ) is a Japanese book editor that has planned, written, and edited many of the Ultimania series books by Square Enix. Studio BentStuff wrote the first Ultimania book for Final Fantasy VIII in 1999, though the company had been contracted to write various Kaitai Shinsho guides for Square games published by Famitsu including the Final Fantasy VII Kaitai Shinsho The Complete. Since then, Ultimania books have been published for every major Final Fantasy title.

Studio BentStuff formed in 1989 from people who worked at MyCom Basic Magazine. The CEO is Akira Yamashita (山下 章). In February 2018, Digital Hearts Co., Ltd. acquired Studio BentStuff, and are credited on guides as "Studio BentStuff/DIGITAL HEARTS".