Maria Esther Andion Bueno (11 October 1939 – 8 June 2018) was a Brazilian professional tennis player. During her 11-year career in the 1950s and 1960s, she won 19 Grand Slam titles (seven in women's singles, 11 in women's doubles, and one in mixed doubles), making her the most successful South American female tennis player in history, and the only one to ever win Wimbledon. Bueno was the year-end number-one ranked female player in 1959 and 1960 and was known for her graceful style of play.

In 1960, Bueno became the first woman ever to win a calendar-year Grand Slam in doubles (all four majors in a year), three of them with Darlene Hard and one with Christine Truman.