Claire Liu (/luː/ LOO; Chinese: 刘婧文; pinyin: Liú Jìngwén ; born May 25, 2000) is an American tennis player. In 2017, she was the World No. 1 in the junior rankings after winning the Junior Wimbledon title, and finishing runner-up at the Junior French Open. Liu also won a junior grand slam doubles title at Wimbledon with Usue Arconada in 2016.
On the pro circuit, Liu has won three ITF singles titles and reached a career-high WTA singles ranking of No. 137.
Liu won the Junior Wimbledon doubles tournament in 2016 with fellow American Usue Arconada, defeating Mariam Bolkvadze and Caty McNally in straight sets in the final. The following year after losing in the Junior French Open final to Whitney Osuigwe, she came back to win the Junior Wimbledon singles title against Ann Li, making her the first American girl to win the event since Chanda Rubin in 1992. With this grand slam success, Liu rose to No. 1 in the ITF girls' junior rankings.