Sonic Adventure 2 is a platform game developed by Sonic Team USA and published by Sega in 2001 as a part of the Sonic the Hedgehog series. Sonic Adventure 2 is the sequel of Sonic Adventure.

It was released in North America on June 19th, 2001 and in Japan and Europe on June 23, 2001 to mark the 10th anniversary of the release of the original Sonic the Hedgehog. This game introduces two new playable characters, Shadow the Hedgehog and Rouge the Bat, and is also one of the few Sonic games to officially feature Doctor Eggman as a playable character. On December 10, 2001, a port of the game called Sonic Adventure 2 Battle was released onto the Nintendo GameCube in Japan, followed by North America on February 12, 2002 and Europe on May 3, 2002.