Thomas Macdonough, Jr. (21 December 1783 – 10 November 1825) was an early-19th-century American naval officer noted for his roles in the first Barbary War and the War of 1812. He was the son of a revolutionary officer, Thomas Macdonough, Sr. who lived near Middletown, Delaware. He was the sixth child from a family of ten siblings and was raised in the countryside. He entered naval life at an early age, receiving a midshipman's commission at the age of sixteen. Serving with Stephen Decatur at Tripoli, he was a member of "Preble's Boys", a select group of U.S. naval officers who served under the command of Commodore Preble during the First Barbary War. Macdonough achieved fame during the War of 1812, commanding the American naval forces that defeated the British navy at the Battle of Lake Ch