Stephen Leeder (AO FRACP FFPH FAFPHM FRACGP, born 13 December 1941 in Grafton, New South Wales) is an emeritus professor of public health and community medicine at the University of Sydney, where he was dean of medicine from 1997 to 2002. Leeder is an adjunct professor of public health at the Western Sydney University, an adjunct professor of epidemiology at the Columbia University Mailman School of Public Health in New York and chair of the Western Sydney Local Health District Board.He was editor-in-chief of The Medical Journal of Australia until he was fired in 2015 for criticizing the decision to outsource its production to Elsevier. All but three of the MJA's editorial advisory committee resigned after the decision to fire Leeder, and the dissidents wrote to Australian Medical Association president Brian Owler asking him to review the decision. Ken Harvey supported Leeder, saying that his firing and the use of Elsevier "is a mistake that is fairly irredeemable". On 1 January 2017, Leeder became editor-in-chief of the International Journal of Epidemiology.