Yuki Kawauchi (????, Kawauchi Yuki, born 5 March 1987) is a Japanese marathon runner.
He came to prominence after running the 2011 Tokyo Marathon in 2:08:37, finishing as the first Japanese and third overall.
He is known as the "citizen runner" given that he works full-time for the government of Saitama Prefecture and trains in his time off with his own expenses without any sponsorship.Kawauchi is a frequent competitor, entering many races each year (averaging a marathon per month) ranging in distance from the 1500 m to the 50 km ultramarathon.
Among his better performances are victories at the Boston Marathon, the Hokkaido Marathon and the Beppu-Oita Marathon and top-three finishes at the Tokyo Marathon and Fukuoka Marathon (the two most important marathons in Japan).
His personal best for the distance is 2:08:14 (Seoul 2013).
In spite of being an amateur, he has represented Japan internationally at the World Championships in Athletics and the IAAF World Half Marathon Championships.
He has two younger brothers, Yoshiki and Koki Kawauchi, who are also marathon runners.