Gérard Diffloth (born in Châteauroux, France, 1939) is a retired linguistics professor, formerly of the University of Chicago, Chicago, Illinois, and Cornell University, Ithaca, New York. He received his Ph.D. from UCLA, after a dissertation on the Irula language. Diffloth is a leading specialist in the Austroasiatic languages. He is an advocate of immersion fieldwork for linguistic research.
Diffloth is known for his widely cited 1974 and 2005 classification of the Austroasiatic languages.
He is a Consulting Editor of the Mon–Khmer Studies Journal.[1]