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Sonic X-treme is an unreleased Sonic the Hedgehog game, developed by Sega Technical Institute and set to be published by Sega of America during the mid-1990s.

X-treme is perhaps the most infamous Sonic game to be cancelled, and personifies much of the problems related to Sega's corporate structure for much of the decade. Following a showing at E3 1996, X-treme was aggressively pushed by Sega of America in an attempt to boost flagging Sega Saturn sales during the Christmas 1996 season. However, after a troubled development timeline, the project was shelved, and a Saturn port of Sonic 3D: Flickies' Island was released in its place.