Simon Kaplan (b. 7 Feb. 1993 in Maisons-Laffitte, FR) is a French composer, researcher and pedagogue. He graduated from the Royal Flemish Conservatoire of Brussels (M.A. cum laude in composition, 2022) and the Royal Conservatoire of Mons (M.M. cum laude in compositional didactics, 2023), where he studied in the classes of Peter Swinnen and Claude Ledoux.

Kaplan's music includes solo and chamber pieces and has been premiered internationally by renowned performers, particularly on the European stage and in Japan.

In 2021, the young artist invented diahemitonicism, a quarter-tonal composition system which has governed his works ever since. His article on this system was published in Tempo in Oct. 2023.

The microtonalist is currently working as a teaching fellow at the University of North Texas, where he is pursuing a Ph.D. in composition. He regularly lectures on the design of microtonal composition systems.