is a Japanese amateur astronomer and a discoverer of minor planets at the Nanyo Observatory (), Yamagata prefecture, Japan.
He is a prolific discoverer of asteroids, credited by the Minor Planet Center with a total of 130 discoveries between 1995 and 2000.
The main-belt asteroid 7769 Okuni, discovered by Satoru Otomo at the Kiyosato Observatory in 1991, is named in his honour. Naming citation was published on 9 January 2001 ().