List of ambassadors of Great Britain to Portugal

The ambassador of Great Britain to Portugal was the foremost diplomatic representative in Portugal of the Kingdom of Great Britain, created by the Treaty of Union in 1707, in charge of the British diplomatic mission.

For ambassadors from the Court of St James's to Portugal before 1707, see the list of ambassadors of the Kingdom of England to Portugal. For ambassadors after 1800, see the list of ambassadors from the United Kingdom to Portugal.

Heads of mission

 * 1707–1708: Sir Paul Methuen (last English ambassador to Portugal)
 * 1708–1710: Henri de Massue, Earl of Galway
 * 1709–1710: Thomas Leffever Chargé d'affaires in absence of Galway>
 * 1710–1714 George Delaval
 * 1714–1722: Henry Worsley
 * 1722–1724: Hon. Thomas Lumley
 * 1725–1728: Brigadier James Dormer
 * 1728: Charles Crompton Chargé d'affaires
 * 1728–1742: Lord Tyrawley
 * 1742–1745: Charles Crompton (Chargé d'affaires from 1741)
 * 1745: Abraham Castres Chargé d'affaires
 * 1745–1749: Sir Benjamin Keene
 * 1749–1757: Abraham Castres
 * 1757–1767: Hon. Edward Hay
 * 1760: Thomas Hay, 9th Earl of Kinnoull Special Mission
 * 1762: Lord Tyrawley Envoy Plenipotentiary
 * 1767–1770: William Henry Lyttelton (created Lord Westcote in 1776 and Lord Lyttelton in 1794): Envoy-extraordinary and Plenipotentiary
 * 1771–1800: Hon. Robert Walpole Envoy Extraordinary and Plenipotentiary
 * 1786: William Fawkener (jointly with Walpole) for negotiating commercial affairs
 * 1800: John Hookham Frere (first United Kingdom ambassador to Portugal)