Shoichiro Irimajiri(入交 昭一郎Irimajiri Shōichirō, born on January 3, 1940 in Kobe, Japan) was a Japanese engineer and businessman. He earned an aeronautical engineering degree from the University of Tokyo and worked for Honda Motor Co., Ltd. for 20 years, overseeing the introduction of its Honda CBX1000|CBX motorcycle, design of their F1 racing engines as well as being the president of Honda of America Inc. He resigned in 1992 due to a heart problem, and started a Chinese traditional treatment to restore his condition.