Jan Maciej Błachowicz is a Polish professional mixed martial artist. He currently competes in the Light Heavyweight division of the Ultimate Fighting Championship (UFC), where he is a former UFC Light Heavyweight Champion. Błachowicz is the second Polish fighter to win a UFC title after Joanna Jędrzejczyk and the first male Polish champion. A professional since 2007, he also competed for KSW and is the former KSW Light Heavyweight Champion.