Barnabas Kelet Henagan (June 7, 1798 – January 10, 1855) was a physician and South Carolina politician who became the 58th Governor due to the death of Patrick Noble on April 7, 1840.
He was educated at the academies in Marlboro County and he went on to study medicine at the University of Heidelberg in Germany.
In the final year of his term, Governor Patrick Noble died on April 7, 1840, and Henagan assumed the governorship.
His term as governor lasted less than a year, but Henagan deplored to the Legislature the poor condition of the public schools in the state and the corruption of the electoral process.
Henagan died on January 10, 1855, in Charleston and was buried at Rogers Cemetery in Marlboro County.