Sun Tiantian (simplified Chinese: 孙甜甜; traditional Chinese: 孫甜甜; pinyin: Sūn Tiántián; born 12 October 1981) is a Chinese former professional tennis player.

In September 2000, Sun won two successive US$10,000 ITF singles titles, a feat she would repeat in June 2001, when she won another two back-to-back.

In 2002, she found repeat success at the next level up, winning two $25,000 tournaments: firstly in April, at Ho Chi Minh City, Vietnam (beating countrywoman Zheng Jie in the semi-final and Korean Jeon Mi-ra in the final); and then in August at Beijing (beating Zheng Jie in the semi-final again, and Rika Fujiwara of Japan in the final)

In 2003, she reached the final of a $50,000 tournament at Modena despite entering as a lucky loser to countrywoman Yan Zi in the final round of qualifying. Having defeated several high-quality opponents in the forms of Martina Suchá, Maret Ani and Gala León García, she lost in the final against Melinda Czink.

This year, she also gained entry into several WTA tournaments, most notably coming through qualifying at Doha by defeating Yuliana Fedak, Ľubomíra Kurhajcová and María Sánchez Lorenzo, only to lose in the deciding set of her opening round match against Nicole Pratt; and at the US Open after a narrow victory over Selima Sfar, only to lose to Saori Obata at the first hurdle in the main draw. But she finished the year ranked World No. 141.

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