Kséniya Moustafaeva (born 8 June 1995 in Minsk, Belarus) is a French individual rhythmic gymnast of Belarusian origin.

She won the bronze medal in all-around at the 2013 Mediterranean Games behind Greek gymnast Varvara Filiou.

Moustafaeva then competed at the 2014 MTM International Tournament and won the all-around silver medal behind Katsiaryna Halkina.

On 30 May - 1 June Moustafaeva competed at the 2014 Minsk World Cup and finished 5th in all-around behind Maria Titova, she qualified to 2 event finals (hoop, clubs).

Moustafaeva finished 10th in all-around at the 2015 Bucharest World Cup, she qualified to 3 event finals and won bronze in clubs.

On 9–13 September Moustafaeva competed at the 2015 World Championships in Stuttgart where she qualified to 1 apparatus final finishing 7th in ribbon (17.750).

[11] On 1–3 April Moustafaeva competed at the 2016 Pesaro World Cup where she finished 7th in the all-around with a total of 71.700 points; she also qualified to hoop, ball and clubs final.

Recovering from injury, Moustafaeva withdrew from the 2016 European Championships nomination list; her quota was then replaced by Finland's Jouki Tikkanen.

On 8–10 July Moustafaeva returned to competition from her at the 2016 Kazan World Cup where she finished 12th in the all-around with a total of 70.500 points and qualified to the ball finals.

On 19–20 August Moustafaeva competed at the 2016 Summer Olympics held in Rio de Janeiro, Brazil.

Moustafaeva competed at the quadrennial held 2017 World Games in Wrocław, Poland, from 20 to 30 July, she qualified in 2 apparatus finals finishing 6th in clubs and 8th in ribbon.