Hsieh Su-wei is a Taiwanese professional tennis player. On 25 February 2013, she reached a career-high singles ranking of world No. 23, and on 12 May 2014, she reached world No. 1 in the doubles rankings. Hsieh has won three singles and 34 doubles titles on the WTA Tour, one WTA 125 doubles title, 27 singles and 23 doubles titles on the ITF Circuit, seven medals at the Asian Games, one gold and one bronze medal at the 2005 Summer Universiade, and has amassed over $10 million in prize money. She has spent a total of 52 weeks with the top doubles ranking, the longest tenure by a tennis player from East Asia and 2nd longest of an Asian player after Sania Mirza. Hsieh is the highest-ranked Taiwanese player in history, in both singles and doubles.

The WTA rankings are the ratings defined by the Women's Tennis Association, introduced in November 1975. The computer that calculates the ranking is nicknamed "Medusa".