Simon McDonald, Baron McDonald of Salford

Simon Gerard McDonald, Baron McDonald of Salford, GCMG, KCVO (born 9 March 1961) is a British former diplomat who was the Permanent Under-Secretary at the Foreign and Commonwealth Office and Head of the Diplomatic Service until September 2020. He was the last professional head of the Foreign & Commonwealth Office before the creation of the Foreign, Commonwealth and Development Office. He has been the Master of Christ's College, Cambridge since September 2022.

In July 2022 McDonald wrote a letter to the Parliamentary Commissioner for Standards stating that denials of previous allegations against Chris Pincher by the Prime Minister Boris Johnson were untrue. The letter was described as an "extraordinary, devastating intervention", and was followed by resignations of senior cabinet ministers, ultimately leading to Johnson's announcement of his resignation on 7 July 2022.