Kōichirō Morioka (森岡 紘一朗, Morioka Kōichirō, born 2 April 1985 in Nagasaki) is a Japanese race walker. He has enjoyed success at University and regional levels, having won two bronze medals at both the Summer Universiade (2005, 2007) and the Asian Games (2006, 2010). Morioka has competed at the four World Championships in Athletics (2005 to 2011) and has twice represented Japan at the Summer Olympics (2008, 2012). He also won a silver medal at the 2009 East Asian Games.