Sir Thomas Baker KCB, KWN (1771 – 26 January 1845) was an officer of the Royal Navy, who saw service during the American War of Independence, and the French Revolutionary and Napoleonic Wars. He had obtained his own command during the French Revolutionary Wars and was to play a part in bringing about three of the battles of the Napoleonic Wars, the Battle of Copenhagen, the Battle of Trafalgar, and the Battle of Cape Ortegal. He only directly participated in the third, but his actions there, and the capture of the French frigate beforehand brought him honours and rewards. While towing the "Didon" to a British port, he and another vessel were sighted by the combined Franco-Spanish fleet under Pierre-Charles Villeneuve, and mistaken as scouts for the Channel Fleet. He therefore turned south to Cadiz, leading to the abandonment of the planned invasion of England, and the destruction of the French fleet at Trafalgar by Horatio Nelson some months later. He rose through the ranks after the end of the wars with France, and was commander of the South America Station during Charles Darwin's voyage aboard . He eventually died with the rank of vice-admiral in 1845 after a long and distinguished career.