Suh Yun-bok (born January 9, 1923) is a former South Korean athlete, who is best known as the winner of the 1947 Boston Marathon. He won the race with a world best time of 2:25:39 under the coach Sohn Kee-chung, the Korean winner of the marathon at the 1936 Berlin Olympics. His participation in the Boston Marathon was financed by donations from servicemen in the United States Forces Korea. His win was the only time a world best for the men's marathon was set at the Boston Marathon. The previous world best was set by his coach Sohn in Tokyo, Japan in 1935. At 166 cm tall and weighing 56 kg, he was said to be the shortest winner ever of the Boston Marathon.
In 1948, one year after the Boston victory, Suh raced the marathon in 1948 Summer Olympics held in London. He retired in 1949.