Duncan Nathaniel Ingraham (6 December 1802 – 16 October 1891) was an officer in the United States Navy.
Captain Ingraham was born in Charleston, South Carolina. He was appointed Midshipman 18 June 1812 at the age of 10 and, after distinguished service, was commissioned Captain 14 September 1855. While in command of the sloop-of-war St. Louis in the Mediterranean, in July 1853, he interfered with the detention by the Austrian consul at Smyrna of Martin Koszta , a Hungarian who had declared in New York his intention of becoming an American citizen, and, who had been seized and confined in the Austrian ship Hussar. For his conduct in this matter he was voted thanks and a medal by Congress.
Captain Ingraham served as Chief of the Bureau of Ordnance and Hydrographer of the Navy from 1856 until 1860.
He resigned from the Navy 4 February 1861 to enter the Confederate States Navy with the rank of captain. He was commandant of the Charleston station 1862 to 1865.
He died at Charleston 16 October 1891.
Four ships of the US Navy have been named USS Ingraham in his honor.
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