Haruhiro Yamashita (山下 治広, Yamashita Haruhiro, born November 11, 1938) is a Japanese gymnast, who competed in the 1964 Summer Olympics. He won two gold medals, in the vault and team combined exercises. After marriage he changed his last name from Yamashita to Matsuda (松田), adopting his aunt's surname, who took care of him as a child. In 1961, he graduated from Nippon Sport Science University, where in 1983 he became professor and later professor emeritus. In the early 1970s he was an assistant gymnastics coach under at the Indiana State University. There he began his research on biorhythms.