Gleb Paul Krotkov, FRSC (May 9, 1901 – January 29, 1968) was a Russian-Canadian academic and plant physiologist. Born in Moscow, Russian Empire, he joined the White Russian Navy. After the defeat of the White forces in 1920 during the Russian Civil War, he managed to escape to Prague. Later he emigrated to Canada and received his Ph.D. from the University of Toronto in 1934. He then joined the faculty of biology at Queen's University and taught there until his death.