Zen-On Music Company Ltd

 is a music publishing company based in Shinjuku, Tokyo, in Japan. Zen-On publishes sheet music for sale and rental, including orchestral scores, band and wind ensemble music, solo works and contemporary works, such as Frederic Rzewski's "People United ..." The company was founded in 1931.
Zen-On are also responsible for the publications of Asian classical composers, such as Joe Hisaishi.