Cornelius Mahoney Sheehan (October 27, 1936 – January 7, 2021) was an American journalist. As a reporter for The New York Times in 1971, Sheehan obtained the classified Pentagon Papers from Daniel Ellsberg. His series of articles revealed a secret United States Department of Defense history of the Vietnam War and led to a U.S. Supreme Court case, New York Times Co. v. United States, 403 U.S. 713 (1971), which invalidated the United States government's use of a restraining order to halt publication.