Graham Anderson Martin was an American diplomat. He was the ambassador to Thailand and as U.S. representative to SEATO from 1963 to 1967, ambassador to Italy from 1969 to 1973 and the last United States Ambassador to South Vietnam from 1973 until his evacuation during the Fall of Saigon in 1975.

The fall of Saigon was the capture of Saigon, the capital of South Vietnam, by North Vietnam on 30 April 1975. The event marked the end of the Vietnam War and the collapse of the South Vietnamese state, leading to a transition period and the formal reunification of Vietnam into the Socialist Republic of Vietnam under communist rule on 2 July 1976.