James M. Cantor (born January 2, 1966) is a Canadian clinical psychologist and research scientist specializing in sexology, specifically on atypical sexualities. He has been called the "foremost living expert on paraphilias," being "at the forefront of neuroimaging studies of pedophiles." He is an associate professor in the Department of Psychiatry of the University of Toronto's Faculty of Medicine, and the Head of the Law and Mental Health Research Section of the Centre for Addiction and Mental Health.
Cantor studied interdisciplinary science at the Rensselaer Polytechnic Institute, with a concentration in computer science and minors in mathematics and physics. He obtained an MA from Boston University and a PhD in clinical psychology from McGill University with a thesis on "Reversal of fluoxetine-induced sexual dysfunction in male rats."