Akinobu Osako (大迫明伸) (born 27 November 1960) is a retired judoka from Japan, who represented his native country at the 1988 Summer Olympics in Seoul, South Korea. There he won a bronze medal in the men's middleweight division (86 kg), alongside Ben Spijkers from the Netherlands. Osako was born in Nishimorokata District, Miyazaki and began judo at the age of a junior high student. He entered noble Asahi Kasei of the judo after graduation in Tenri University. In the days of active play, he was good at Seoi Nage, Tai Otoshi and Uchi Mata.