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.
He was the first lay Rector of Université Laval, holding this position from 1972 to 1977.
In 1982 he received the Gold Medal from the Canadian Council of Professional Engineers.
He was elected Fellow of the Royal Society of Canada and was president from 1976 to 1977.