Leo Rich Lewis (11 February 1865 – 8 September 1945) was an American composer. He graduated from Tufts College in Massachusetts in 1887 and later served as Fletcher Professor of Music and chairman of the music department there from 1892 to 1945. He taught courses in music history and theory, as well as composition. He composed the Tufts College alma mater.
The Leo Rich Lewis Memorial Scholarship, established in 1950 by classmates, former students, family, and friends in his memory, is awarded each year to a Tufts University student, with preference given to students majoring in music.