Peter Henry Rae Green (born 30 January 1947) is an Australian-born gastroenterologist and Professor of Clinical Medicine and Director of the Celiac Disease Center at Columbia University, New York City.
He is notable for his expertise is celiac disease and his research includes epidemiology, clinical manifestations, associated diseases and the pathophysiological mechanisms of the syndrome.
Green has an active research collaboration with the Karolinska Institute in Sweden.