Ksénia Chasteau (born 12 March 2006 in Irkutsk) is a French wheelchair tennis player of Russian descent, she was a former junior World number one in 2023.

She was 2023 US Open and 2024 French Open wheelchair junior singles and doubles champion with Maylee Phelps.

[1][2] In January 2021, Chasteau and her father were involved in a motorbike accident.

[3] Before her accident, Chasteau was a promising tennis player who had started the sport aged four years old in Marseille.

She started wheelchair tennis in September 2021 after rehabilitation, she rocketed up the rankings and went on to reach junior world number one in 2023.