Li Na (Chinese: 李娜; pinyin: Lǐ Nà; born February 26, 1982 in Wuhan, Hubei), is a Chinese professional female tennis player. She has been one of the most successful tennis players in the country's history, and has been instrumental in advancing the sport within China.

Between 1999 and 2004, Li won 20 women's singles titles: 19 ITF events and one—the first ever won by a Chinese woman—on the WTA Tour. In January 2008 she won her second WTA Tour title after a drought of over three and a quarter years.

She is noted in her playing style for quick reflexes and athleticism around the court and fast groundstrokes which she scatters unpredictably to all corners of the playing surface.

On June 19, 2006, Li became the first Chinese woman to be ranked within the WTA top 30 at No. 30. Two months later, on August 14, 2006, Li entered the top 20 for the first time at No. 20. Her highest ranking to date is No. 16.

Li also frequently enters doubles tournaments at events alongside singles, and has won two WTA doubles titles and 16 further ITF doubles events. Her early success in doubles came mostly with Ting Li; but more recently she has made a habit of forming temporary women's doubles partnerships with players with whom she has previously enjoyed a healthy rivalry through repeated head-to-head meetings in singles tournaments, notably Liu Nan-Nan, Nicole Pratt, Yan Zi and Jelena Janković, in addition to her countrywoman Peng Shuai.

Her career has been plagued by injuries that have interrupted her from playing for lengthy periods. She suffered a two-year hiatus from competition in her early 20s, lost several months at the height of the 2005 season to an ankle injury, and lost the second half of 2007 to a rib injury.