Sakunosuke Koyama (19 January 1864 – 27 June 1927) was a Japanese composer and music teacher.
Koyama left for Tokyo in 1880 without permission from his family and began studying English, mathematics and music at the University of Tsukiji.
In addition to his work at this institution, he composed and published a collection of folk songs.
Some songs also made Koyama known outside of Japan, particularly in China, which had begun to incorporate European music into the education system after the defeat in the First Sino-Japanese War (1894–1895).
In 1904, he was appointed advisor and consultant to the musical instruments factory, Yamaha Corporation.