Alexander Duncan (1788 – March 23, 1853) was a 19th Century American physician who served as a U.S. Representative from Ohio for four terms from 1837 to 1845.
Born in Bottle Hill (now Madison), Morris County, New Jersey, Duncan studied and practiced medicine.
He did not run in 1844 for reelection to the Twenty-ninth Congress but instead resumed the practice of his profession.
He died in Madisonville (now a part of Cincinnati), Hamilton County, Ohio, March 23, 1853, and is interred in Laurel Cemetery.
This article incorporates public domain material from the Biographical Directory of the United States Congress