Koudai Tsukakoshi

 is a Japanese racing driver.
Career.
Formula Three.
After competing in Formula Dream in 2004, Tsukakoshi moved into the All-Japan Formula Three Championship for the 2005 campaign. Competing for M Tec, Tsukakoshi finished his first season in fourteenth position. He moved to Honda Team Mugen for the 2006 season, finishing fifth in the standings, taking a victory at Suzuka. Another fifth place championship finish followed in 2007, as Tsukakoshi took two wins for Honda Team Real at Okayama and Suzuka. He also finished in second place at the prestigious Macau Grand Prix for Manor Motorsport; finishing behind Oliver Jarvis. Tsukakoshi moved to Manor Motorsport and the Formula Three Euroseries for the 2008 season. He finished seventh in the championship standings, with a best result of second place on four occasions.