Sarah Lee Wai Sze, BBS, MH[2] (Chinese: 李慧詩; Jyutping: lei5 wai6 si1; born 12 May 1987) is a former Hong Kong professional track cyclist.

[1] She grew up in a poor family in Ngau Tau Kok, sharing a 200-square-foot public flat with her parents and two older siblings.

[11] Lee captured the attention of Hong Kong when she won gold at the 500-meter time trial track cycling event at the 2010 Asian Games,[12] in which she broke the Asian Record in winning the championship with a time of 33.945 s.[13] Lee also won a bronze in the sprint event.

[15] Lee's performance has impressed the cycling hierarchy, and she received the Hong Kong Potential Sports Stars Awards for 2010.

[16] She also received the Medal of Honour from the Hong Kong Government in 2011 for her outstanding achievements in international cycling competitions.

[22][23] Lee also participated in the women's sprint event although she did not progress through the 1/8 Finals after losing to Cuba's Lisandra Guerra.

[24] Lee received HK$ 750k from the Hang Seng Athlete Incentive Awards Scheme for her achievement in the Games.

[28] Lee won her first medal in 2013 by coming third in the women's sprint event in the third leg of the 2012–13 World Cup series.

[29] In February 2013, Lee carried on her good form and won gold in the women's 500m time-trial at the World Track Championships in Belarus.

In the sprint event, Lee advanced to 1/16 finals but lost to Katy Marchant of Great Britain to fall into the repechage.

In the semifinals, she lost to Olena Starikova from Ukraine and had to race in the bronze medal match against the reigning world champion Emma Hinze of Germany.