Marshall Johnson Wellborn (29 May 1808-16 October 1874) was a member of the US House of Representatives (D-GA 2) from 4 March 1849 to 3 March 1851, succeeding Alfred Iverson, Sr. and preceding James Johnson. Born in Eatonton, he practiced law in Columbus before serving in the state house from 1833 to 1834, as a state judge from 1838 to 1842, and in Congress.