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Tan Ruiwu (born 30 June 1983) is a Croatian table tennis player of Chinese origin. As of December 2012, he is ranked no. 48 in the world by the International Table Tennis Federation (ITTF). He is also left-handed, and uses the shakehand grip.
Tan represented his adopted nation Croatia at the 2008 Summer Olympics in Beijing, where he competed for the singles and team events. In his first event, men's singles, Tan received two byes in the preliminary rounds, before defeating Japan's Seiya Kishikawa, Singapore's Gao Ning, and Hong Kong's Li Ching. He reached the quarterfinal round of the competition, where he lost to China's Wang Liqin, with a unanimous set score of 0–4. Few days later, Tan joined the national team, with his fellow players Andrej Gaćina and six-time Olympic veteran Zoran Primorac, for the inaugural men's team event. He and his team placed second in the preliminary pool, with two victories and a single defeat from the German team (led by Dimitrij Ovtcharov), but was offered a second chance for the bronze medal by entering the playoffs. Tan and his team, however, lost their first playoff to the Austrian team, with a set score of 1–3.