John Larkin Kerwin CC OQ FRSC (June 22, 1924 – May 1, 2004) was a Canadian physicist. Born in Quebec City, he studied physics at St. Francis Xavier University and obtained his master's degree in physics at the Massachusetts Institute of Technology. His received his D.Sc. from Université Laval. He was Chairman of the Department of Physics from 1961 to 1967. He was the first lay Rector of Université Laval, holding this position from 1972 to 1977. He died in Quebec City, Quebec, Canada. He was married to Maria G. Turcot and had 8 children.