Nam Sung-yong (November 23, 1912 – February 20, 2001) was a Korean Olympian who won a bronze medal in the marathon at the 1936 Summer Olympics, completing the run in 2 hours, 31 minutes, and 42 seconds.

He was born in Junten (Suncheon), Korea, Empire of Japan and received higher education in Japan.

Like the gold medalist Sohn Kee-chung, Nam Sung-yong used the Japanese pronunciation of his name, Nan Shōryū as Korea was then a part of the Japanese Empire.

[1] After the Olympics, Nam Sung-yong worked at the Korean Sporting Association with Sohn Kee-chung.

This biographical article relating to South Korean athletics is a stub.