Yoshiaki Unetani (采谷 義秋, born October 6, 1944 in Hiroshima, Japan) is a Japanese former long-distance runner. Unusually for an elite athlete, he combined training with his job as a high school teacher. He has a personal best for the marathon of 2.12:12 which he set in at the Fukuoka Marathon in 1970. He competed in the marathon at the 1972 Summer Olympics in Munich, placing 36th. He secured his place at Munich by finishing third in the Lake Biwa Marathon, a race he had won the previous year. He won the 1969 Boston Marathon in a time of 2.13:49.