Monica Seles (Serbian: Моника Селеш, Monika Seleš, Hungarian: Szeles Mónika, pronounced [sɛlɛʃ], born December 2, 1973) is a former world no. 1 professional tennis player and a member of the International Tennis Hall of Fame. She was born and raised in Novi Sad, SR Serbia, SFR Yugoslavia, to Hungarian parents. She became a naturalized United States citizen in 1994 and also received Hungarian citizenship in June 2007. She won nine Grand Slam singles titles, winning eight of them while a citizen of Yugoslavia and one while a citizen of the United States.

She became the youngest-ever champion at the 1990 French Open at the age of 16. She was the world no. 1 player in the women's game during 1991 and 1992, but in 1993 she was forced out of the sport for more than two years following an on-court attack in which a man stabbed her in the back with a 9-inch-long knife. She enjoyed some success after returning to the tour in 1995, including a Grand Slam singles title at the 1996 Australian Open, but was unable consistently to reproduce her best form. She played her last professional match at the 2003 French Open, but her official retirement announcement was not issued until February 2008.