The men's 200 metres sprint event at the 1948 Summer Olympics took place between 2 August and 3 August. There were 51 competitors from 28 nations. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The final was won by American Mel Patton. His countryman Barney Ewell earned silver, making this the third consecutive Games the United States took the top two spots in the event. Lloyd La Beach's bronze gave Panama a medal in its debut in the event.