Mackenzie Dern is an American and Brazilian professional mixed martial artist and Brazilian Jiu-Jitsu practitioner currently competing in the women's strawweight division of the Ultimate Fighting Championship, where she is the current UFC Women's Strawweight Champion. She is a former world no. 1 ranked IBJJF competitor, currently ranked 6th among the female divisions.  She is an ADCC and no gi BJJ (black belt) world champion.  As of March 24, 2026, she is #6 in the UFC women's pound-for-pound rankings.

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