Sir John Thomas Duckworth, 1st Baronet, GCB (9 February 1748 – 31 August 1817) was an officer of the Royal Navy, serving during the Seven Years' War, the American War of Independence, the French Revolutionary and Napoleonic Wars, as the Governor of Newfoundland during the War of 1812, and a member of the British House of Commons during his semi-retirement. Duckworth, a vicar's son, achieved much in a naval career that began at the age of 11.