Michael Corcoran (September 21, 1827 – December 22, 1863) was an Irish general in the Union Army during the American Civil War and a close confidant of President Abraham Lincoln. As its colonel, he led the 69th New York Regiment to Washington, D.C. and was one of the first to serve in the defense of Washington by building Fort Corcoran. He then led the 69th into action at the First Battle of Bull Run.