Duncan McFarlan (* in Laurel Hill, Scotland County, North Carolina, † September 7, 1816 ) was an American politician. Between 1805 and 1807 he represented the state of North Carolina in the U.S. House of Representatives.
Duncan McFarlan attended the public schools of his home and was then engaged in farming. At the same time he began a political career. In 1792 he was elected to the House of Representatives from North Carolina. Between 1793 and 1809 he sat several times in the State Senate. End of the 1790s he joined, founded by Thomas Jefferson Democratic- Republican Party. In 1802 he ran unsuccessfully for Congress yet.
In the congressional elections of 1804 McFarlan then in the seventh constituency of North Carolina in the U.S. House of Representatives in Washington DC was chosen, where he became the successor of Samuel D. Purviance on March 4, 1805. Until March 3, 1807, he was able to complete a legislative sessions in Congress. After his retirement from the U.S. House of Representatives Duncan McFarlan worked in trade and agriculture. He died on 7 September 1816 in his birthplace, Laurel Hill.