Oswald Jonas (January 10, 1897 – March 19, 1978) was a music theorist and musicologist, and student of Heinrich Schenker.^[1] Despite Schenker's conservative nationalist views Jonas was an admirer of Karl Kraus.^{[citation needed]}

In 1935, Jonas founded the Schenker Institut and began publishing Der Dreiklang with Felix Salzer.^{[citation needed]} The Oswald Jonas Memorial Collection, housed at the University of California, Riverside Library, holds the complete diaries of Schenker and much of the correspondence and manuscripts of Erwin Ratz, Jonas's first student. His primary students include Felix Salzer, Ernst Oster, and Sylvan Kalib.^{[citation needed]}

He taught at Roosevelt University in Chicago from 1941 to 1964, and then until his death he taught at the University of California Riverside, where his materials, as well as Schenker's Nachlass, is deposited in the Special Collections Library.^{[citation needed]}