Kōichi Iwaki (岩城滉一, Iwaki Kōichi) is a Japanese actor. He won the award for best actor at the 8th Yokohama Film Festival for the 1986 film Minami e Hashire, Umi no Michi o. He was a Zainichi Korean until April 5, 2017, when he naturalized. Iwaki is also a racing car driver. ()