Joanna Jędrzejczyk (born 18 August 1987) is a Polish mixed martial artist and former Muay Thai kickboxer. She competes in the women's flyweight and women's strawweight division of the Ultimate Fighting Championship (UFC). She is a former UFC Women's Strawweight Champion, reigning for 966 days in total. She has an MMA record of 16 wins and four losses. Her kickboxing record is 27 wins and three losses.