Jack Marshman is a retired Welsh professional mixed martial artist who competed in the Middleweight division. A professional competitor since 2010, he has competed for Ultimate Fighting Championship (UFC), BAMMA and Cage Warriors. He is the former BAMMA Lonsdale Middleweight Champion and former Cage Warriors Middleweight Champion.

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.