Between 1784 and 1793 Auckland was Member of Parliament for Heytesbury. He was sworn of the British Privy Council in 1784 and served as Envoy to France from 1785 to 1787 (on a mission dealing with commerce); he was Ambassador to Spain between 1787 and 1789 and Ambassador to the Netherlands between 1789 and 1793. In 1789 he was raised to the Peerage of Ireland as Baron Auckland and in 1793 he retired from public service, receiving a pension of £2300, and was further honoured when he was made Baron Auckland, of West Auckland in the County of Durham, in the Peerage of Great Britain.