The men's long jump event was part of the track and field athletics programme at the 1948 Summer Olympics. The competition was held on July 31, 1948. Twenty-one athletes from 17 nations competed. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The final was won by American Willie Steele. It was the United States' fifth consecutive and tenth overall gold medal in the men's long jump. Theo Bruce won Australia's first long jump medal with his silver.