The Republic of Korea War Service Medal (ROKWSM) is a decoration of South Korea which was first authorized in December 1950. Originally known as the Incident Participation Medal, the medal was first authorized to South Korean troops who had participated in the initial counter-assaults against North Korean aggression in June 1950.

In 1951, President Syngman Rhee ordered that the Incident Participation Medal be renamed as the War Service Medal and further authorized the decoration to any troops who were defending South Korea against invasion. In 1954, the South Korean government authorized the now called Korean War Service Medal to all United Nations troops who had fought in the Korean War between the dates of June 25, 1950 to July 27, 1953.

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