Duncan McFarlan (died September 7, 1816) was a United States Democratic-Republican U.S.
Born in Laurel Hill, North Carolina in Scotland County, McFarlan engaged in agricultural pursuits.
At the 1788 Hillsborough Convention, he voted against the ratification of the US Constitution.
[1][2] McFarlan stood for election to Congress in 1802, but was unsuccessful; he ran again in 1804 and served one term, in the 9th United States Congress (March 4, 1805 – March 3, 1807).
After his term in Washington, McFarlan returned to North Carolina and engaged in mercantile and agricultural pursuits, serving one further term in the state Senate, from 1807 to 1809.