Kazumasa Hashimoto (b. 1974 in Tokyo, Japan) is a Japanese composer, mastering engineer and web designer.

As a child, Hashimoto learned classical piano, starting to compose in high school while making music on his computer. He majored in composition at Tokyo College of Music. His minimalistic music is a rich blend of electronic textures and acoustic instruments such as cello, violin and clarinet. Hashimoto makes extensive use of the piano, as well as nonsense, collage-like lyrics constructed from digitally edited voice samples.