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. He served in the cabinet of Jefferson Davis as Postmaster General, the only holder of that office. He was an able administrator, presiding over the only cabinet department that functioned well during the war.