Sir David Geoffrey Manning, (born 5 December 1949) is a former British diplomat, who was the British Ambassador to the United States from 2003 to 2007.
He authored the so-called "Manning Memo" summarising the details of a January 2003 meeting between American president George W.
Bush and British prime minister Tony Blair during the run-up to the invasion of Iraq.
Until 2019 he was appointed to the Household of TRH the Duke and Duchess of Cambridge and the Duke and Duchess of Sussex.