The Ambassador of the United Kingdom to the Socialist Republic of Vietnam is the United Kingdom's foremost diplomatic representative in Vietnam, and head of the UK's diplomatic mission in Hanoi.
The list below shows British ambassadors to the Republic of Vietnam (South Vietnam) at its capital, Saigon (now Ho Chi Minh City), from 1954 after the Geneva Conference which separated French Indochina into its component states of Laos, Cambodia and Vietnam and temporarily partitioned Vietnam (although the Geneva agreement was not accepted by South Vietnam) until 1975 when North and South Vietnam were reunified. During that period the British government maintained a consulate-general in Hanoi. The British embassy is now in Hanoi with a consulate-general in Ho Chi Minh City.
French–Vietnamese relations started as early as the 17th century with the mission of the Jesuit father Alexandre de Rhodes. Various traders would visit Vietnam during the 18th century, until the major involvement of French forces under Pigneau de Béhaine from 1787 to 1789 helped establish the Nguyễn dynasty. France was heavily involved in Vietnam in the 19th century under the pretext of protecting the work of Catholic missionaries in the country.
Sir John William Denys Margetson was a British diplomat who served as ambassador to Vietnam, the United Nations, and the Netherlands.
Sir John Oscar Moreton was a British diplomat.