Melvin G. de Chazeau (March 20, 1900 – November 28, 1985) was an American economist and the second Dean of Cornell's S.C. Johnson Graduate School of Management following Paul O'Leary's return to teaching. De Chazeau joined the university's College of Arts & Sciences Economics Department in 1948 and he retired from the Cornell Faculty in 1967. As a professor emeritus, de Chazeau taught at Cornell and Dartmouth College through AY 1969–1970.