Kōichirō Morioka is a Japanese race walker. He has enjoyed success at University and regional levels, having won two bronze medals at both the Summer Universiade and the Asian Games. Morioka has competed at the four World Championships in Athletics and has twice represented Japan at the Summer Olympics. He also won a silver medal at the 2009 East Asian Games.

At the 2009 East Asian Games, the athletics events were held at the Tseung Kwan O Sports Ground in Hong Kong from 10 December to 13 December. A total of 46 events were contested, of which 23 were by male athletes and 23 by female athletes.