Jack Hermansson is a Swedish-Norwegian professional mixed martial artist. He currently competes in the middleweight division of the Ultimate Fighting Championship (UFC). He is the former middleweight champion in Cage Warriors and Warrior Fight Series. As of 7 May 2024, he is #9 in the UFC middleweight rankings.

Cage Warriors (CW) is an Irish-owned mixed martial arts (MMA) promotion company based in London, England. The promotion was established in 2001 and staged its first MMA event in London in July, 2002.