Jack Hirsh CM FRSC (born January 7, 1935) is a Canadian clinician and scientist specializing in anticoagulant therapy and thrombosis. Born in Melbourne, Australia, Hirsh is a graduate of the University of Melbourne Medical School. He studied hematology at Washington University in St. Louis, the London Postgraduate Medical School and the University of Toronto. In 1973 he joined the Faculty of Medicine of McMaster University. He is also the Director of the Hamilton Civic Hospital Research Centre.