William James Porter was a British-born American diplomat who from 1971 to 1973 headed the U.S. delegation to the Paris Peace Talks to end the Vietnam War. Porter was the first-ever United States Ambassador to Algeria, and also served as Ambassador to South Korea, United States Ambassador to Canada, and Saudi Arabia.

The Paris Peace Accords, officially the Agreement on Ending the War and Restoring Peace in Viet Nam, was a peace agreement signed on January 27, 1973, to establish peace in Vietnam and end the Vietnam War. The agreement was signed by the governments of the Democratic Republic of Vietnam ; the Republic of Vietnam ; the United States; and the Provisional Revolutionary Government of the Republic of South Vietnam (PRG), which represented South Vietnamese communists. US ground forces had begun to withdraw from Vietnam in 1969, and had suffered from deteriorating morale during the withdrawal. By the beginning of 1972 those that remained had very little involvement in combat. The last American infantry battalions withdrew in August 1972. Most air and naval forces, and most advisers, also were gone from South Vietnam by that time, though air and naval forces not based in South Vietnam were still playing a large role in the war. The Paris Agreement removed the remaining US forces. Direct U.S. military intervention was ended, and fighting between the three remaining powers temporarily stopped for less than a day. The agreement was not ratified by the U.S. Senate.