John Rosen is a Canadian criminal defence lawyer, who has defended the most murder trials in Ontario's history, and perhaps in Canadian history. He has defended some of the most notorious murderers in Canadian history, including Paul Bernardo, Dominic Musitano, Min Chen, Paul Volpe, John Papalia and Carmen Barillaro (of the Buffalo Crime Family.) He is a partner in the Toronto law firm of Rosen Naster LLP.