Seymour (Sy) Myron Hersh is an American Pulitzer Prize-winning investigative journalist and author based in Washington, D.C. He is a regular contributor to The New Yorker magazine on military and security matters. He has also won two National Magazine Awards and is a "five-time Polk winner and recipient of the 2004 George Orwell Award."

He first gained worldwide recognition in 1969 for exposing the My Lai Massacre and its cover-up during the Vietnam War, for which he received the 1970 Pulitzer Prize for International Reporting. His 2004 reports on the US military's mistreatment of detainees at Abu Ghraib prison gained much attention.