Nikolai Stepulov was an Estonian lightweight boxer, military officer and criminal. As a boxer he won silver medals at the 1936 Olympic Games in Berlin and 1937 European Championships, and fought professionally in 1938–39. During World War II, after the Soviet invasion of Estonia in 1940, Stepulov, an ethnic Russian, became a collaborant in the so-called people's self-defence (RO). Later after returning to Soviet-controlled Estonia he was arrested a few times for burglary and died in a Soviet prison hospital.