Patty Schnyder (born 14 December 1978 in Basel) is a Swiss professional tennis player. She has been playing on the WTA tour since 1993 and is a former World No. 7. She has defeated several World No. 1 players, including Martina Hingis, Lindsay Davenport, Serena Williams, Arantxa Sanchez Vicario, Steffi Graf, Jelena Janković, Ana Ivanović, Jennifer Capriati, Kim Clijsters, Justine Henin, Amelie Mauresmo, and Maria Sharapova.

During her long career, she has reached four Grand Slam singles quarterfinals and one Grand Slam singles semifinal. She has won 11 WTA singles titles and 5 WTA doubles titles and has earned over US$7.6 million in prize money. As of June 8, 2009, Schnyder is ranked World No. 21.

In 1996, Schnyder made her Grand Slam main-draw debut at the French Open. In 1997, she quickly rose up through the rankings, and by August 1998 she had entered the WTA Top 10. However, Schnyder fell out of the Top 10 in April 1999, and spent the next 6 years ranked in the 15–30 range before re-entering the Top 10 in May 2005.