Koh Yasuda (保田 耕, Yasuda Kō, 1907 - September 7, 1943) or Kō Yasuda was a Japanese ophthalmologist who became the first director of Amami Wakoen Sanatorium, a leprosy sanatorium in Amami Ōshima, Kagoshima Prefecture, Japan. He was drafted into military service and died in China in 1943.