John Andrew Barnes III was a soldier of the United States Army during the Vietnam War. He was posthumously awarded the Medal of Honor for his actions during the Battle of Dak To.

The battle of Dak To in Vietnam was a series of major engagements of the Vietnam War that took place between 3 and 23 November 1967, in Kon Tum Province, in the Central Highlands of the Republic of Vietnam. The action at Đắk Tô was one of a series of People's Army of Vietnam (PAVN) offensive initiatives that began during the second half of the year. PAVN attacks at Lộc Ninh, Sông Bé and at Con Thien and Khe Sanh,, were other actions which, combined with Đắk Tô, became known as "the border battles". The post hoc purported objective of the PAVN forces was to distract American and South Vietnamese forces away from cities towards the borders in preparation for the Tet Offensive.