John Henninger Reagan, American judge and politician, 3rd Confederate States Secretary of the Treasury (d. 1905)
John Henninger Reagan (October 8, 1818 – March 6, 1905) was an American politician from Texas. A Democrat, Reagan resigned from the U.S. House of Representatives when Texas seceded from the Union and joined the Confederate States of America. He served in the cabinet of Jefferson Davis as Postmaster General.

After the Confederate defeat and his release from prison after the war, Reagan called for cooperation by the South with the federal government, an unpopular position among most conservative whites. He was elected to Congress in 1874, after his predictions of harsh treatment for resistance to the Reconstruction era were proved correct. He was elected in 1886 by the state legislature as a Democrat from Texas to the US Senate, where he served one term from 1887 to 1891. He resigned from the seat when appointed by the governor as chairman of the Texas Railroad Commission. He was among the founders of the Texas State Historical Association.