Sun Tiantian, Chinese tennis player
Sun Tiantian (Chinese: 孙甜甜; pinyin: Sūn Tiántián; Mandarin pronunciation: [swə́n tʰjɛ̌n tʰjɛ̌n]; born 12 October 1981) is a Chinese former professional tennis player. She won the gold medal at the 2004 Summer Olympics in women's doubles along with her partner Li Ting.

Sun reached a career-high singles ranking of world No. 77 in March 2007, winning her only WTA Tour singles title at the 2006 Tashkent Open, and a career-high doubles ranking of No. 16 in October 2007, winning eleven WTA titles and reaching the quarterfinals of three Grand Slam women's doubles tournaments, and winning the mixed doubles event at the 2008 Australian Open alongside Nenad Zimonjić.