Polina Berezina Ksenofontova (born 5 December 1997)[2] is an individual rhythmic gymnast.

She has competed at seven Rhythmic Gymnastics World Championships and won a bronze medal with the Spanish team in 2022.

She competed at the 2024 Summer Olympics in women's rhythmic individual all-around and placed 15th, cutoff from the finals.

By 2008, her father's work led her to live again in Moscow, and she began to combine her training sessions between Spain, with Mónica Ferrández, and Russia, with Oksana Skaldina.

[3] She made her international debut at the 2013 Gymnasiade and won a bronze medal in the hoop final.

The Spanish team of Berezina, Natalia García, Sara Llana, and Carolina Rodríguez finished 10th.

[18] She competed with the ribbon at the European Championships and helped the Spanish team finish 12th.

[43] She competed at all four events on the 2021 World Cup series to earn points for Olympic qualification.

[48] Berezina competed at the 2021 European Championships, her final chance to earn an Olympic berth.

[54] At the Portimão World Challenge Cup, she finished 10th in the all-around and fourth in the ball final.

[55] Then at the Cluj Napoca World Challenge Cup, she finished 11th in the all-around and eighth in the clubs final.

[56] At the World Championships, she was part of the Spanish delegation that won the bronze medal in the team event.

[63][64] Berezina finished 11th in the all-around at the Portimão World Challenge Cup and seventh in the hoop final.

[66] She then placed 13th in the all-around at the Cluj Napoca World Challenge Cup and eighth in the ball final.