Christian Cyrus Leben (born July 21, 1980) is an American mixed martial artist currently signed to the Ultimate Fighting Championship where he fights as a middleweight. He is known for his aggressive style, heavy hands, and iron jaw.

Leben first attained notoriety for his appearance on the inaugural season of The Ultimate Fighter reality series. He began his UFC career with five victories in a row before suffering a knockout loss to current champion Anderson Silva. He holds notable victories over Mike Swick, Jorge Rivera, Jorge Santiago, Patrick Côté, Alessio Sakara, Yoshihiro Akiyama, and Wanderlei Silva.

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