The ambassador of the United Kingdom to Argentina is the United Kingdom's foremost diplomatic representative in Argentina, and head of the UK's diplomatic mission there. The official title is His Britannic Majesty's Ambassador to the Argentine Republic. From 1853, when the United Kingdom and the Republic of Paraguay established diplomatic relations, until 1941 the British Minister or Ambassador to Argentina was usually also accredited to Paraguay. Since 1941 a British Minister or Ambassador has been resident in Paraguay.

Heads of mission

Minister Plenipotentiary to the United Provinces of Rio de la Plata

Minister Plenipotentiary to the Argentine Confederation

Minister Plenipotentiary to the Argentine Republic

Envoy Extraordinary and Minister Plenipotentiary to the Argentine Republic

Ambassador Extraordinary and Plenipotentiary to the Argentine Republic

From 1982 to 1990, following the Falklands War, there were no diplomatic relations between the UK and Argentina. There was no Ambassador, but the embassy building remained open, as the British Interests Section of the Swiss Embassy, rather than as the British Embassy. The Argentine Embassy in London came under the Brazilian flag during the same period. Diplomatic relations were restored in 1990.