Amusement Vision was a SEGA-owned development studio based in Ōta, Tokyo, Japan. The studio was established in 1998 as Sega AM11 R&D Division, headed by Daytona USA director Toshihiro Nagoshi.
AM11 would become Sega AM4 R&D Division in mid-1999 after several non-software divisions were shuffled around, but along with each of Sega's other development divisions, AM4 was spun off as an independent studio on April 21, 2000, taking the name Amusement Vision. The studio would become well-known for the Super Monkey Ball series, alongside other titles such as Spikeout and F-Zero GX.
The non-sports-game staff of Smilebit was merged into Amusement Vision in October 2003, and Amusement Vision itself was merged back into Sega in July 2004. Nagoshi's team continued to operate within Sega, as Sega CS1, working on the popular Yakuza series as well as newer entries of the Super Monkey Ball series. The Yakuza production team would eventually regain its own identity as Ryu ga Gotoku Studio.