Jeffrey Darren Duncan (born January 7, 1966) is a United States representative for South Carolina's 3rd congressional district since 2011. His district comprises nine counties, two of these counties being manufacturing centers for the state. On January 17, 2024, Duncan announced that he would not run for re-election. Duncan previously served in the South Carolina House of Representatives from 2002 to 2010 when he retired to run for the US House of Representatives.