Stephen Pleasonton (1776? – January 31, 1855) was the first "Fifth Auditor" of the U.S. Treasury Department; he is historically significant for his role in saving early American government documents from possible destruction, but is chiefly remembered today for his singularly bureaucratic work in overseeing the Treasury Department's Lighthouse Establishment during most of its existence. He was also the father of Union Civil War Generals Alfred Pleasonton and Augustus Pleasonton.