Kristina Olegovna Tkach (Кристина Олеговна Ткач; born 19 January 1999) is a Russian professional pool player. She became the 2017 WPA World Nine-ball Junior Championship winner, defeating in the final 9–6. Tkach is a four time European champion having won the eight-ball event in 2016 and 2019, as well as Straight pool in 2017 and 2019. In addition, she is a nine-time Junior European Champion.