Tan Ruiwu (born 30 June 1983) is a Croatian table tennis player of Chinese origin.

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.

[4] During the Tennis Superleague match held in Dubrovnik, Croatia on 15 February 2020, fans of the opposing team began insulting Tan Ruiwu, referring to him as the coronavirus.