Stefanie Li Yun Tan (born 16 September 1992) is a Singaporean former professional tennis player.
Tan has career-high WTA rankings of 438 in singles, achieved on 15 May 2017, and 507 in doubles, reached on 8 May 2017. In her career, she won two singles and two doubles titles on the ITF Circuit.
Playing for Singapore in Fed Cup, Tan has a win/loss record of 19–15.
In the 2017 Southeast Asian Games, Tan claimed the bronze medal in the women's singles tournament, beating Malaysia's Jawairiah Noordin and Vietnam's before falling to eventual gold medalist Luksika Kumkhum. It was Singapore's first medal for women's tennis in 34 years. In the women's doubles tournament, she partnered but they lost in their opener.