Leon Dallin (1918-1993) was an American music theorist whose primary work was Techniques of Twentieth Century Composition: A Guide to the Materials of Modern Music.
Dallin received his bachelors and masters degrees in music from Eastman School of Music and a Ph.D. from The University of California, Berkeley. He then was a professor at Brigham Young University from 1948-1955 and at California State University, Long Beach from 1955 to 1983.