James Henry Duncan (December 5, 1793 – February 8, 1869) was a member of the United States House of Representatives from Massachusetts.

He served in the Massachusetts State Senate from 1828 to 1831, and was a delegate to the Whig National Convention at Harrisburg, Pennsylvania, in 1839.

They had 13 children together, 8 daughters and 5 sons: Rebekah White (died in infancy), James Henry, Benjamin Willis (died in infancy), Rebekah White, Mary Willis, George (died in childhood), Susan Reynolds, Samuel White, Rosanna, Elizabeth, George Willis, Caroline and Margaret.

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