| Yasuo Koyama | |
| Fullname: | Yasuo Koyama |
| Kanji: | 小山靖男 |
| Birth Date: | April 27, 1937 |
| Birth Place: | Okayama, Japan |
| Death Date: | 2000 |
| Rank: | 9 dan |
Koyama was a disciple of Riichi Sekiyama.[1] He became a 9-dan in 1971. He played in the Kansai Ki-in. His disciple was Yahata Koichi.
| Title | Years Held | |
|---|---|---|
| Current | 1 | |
 Kansai Ki-in Championship | 1962 |