Morio Shigematsu (重松 森雄, Shigematsu Morio, born 21 June 1940) is a former Japanese long-distance runner who competed in marathons. On June 12, 1965, Shigematsu set a world's best in the marathon with a time of 2:12:00 at the Polytechnic Marathon. Less than two months earlier, he had set a course record at the 1965 Boston Marathon (2:16:33).In his career, in 22 marathons started, he recorded 6 victories, placed second 3 times and third once. Shigematsu ran seven marathons under 2:20.