The Guantánamo Bay files leak (also known as The Guantánamo Files, or colloquially, Gitmo Files) began on 25 April 2011, when , along with several independent news organizations, began publishing 779 formerly secret documents relating to detainees at the United States' Guantánamo Bay detention camp established in 2002 after its invasion of Afghanistan in 2001. The documents consist of classified assessments, interviews, and internal memos about detainees, which were written by the Pentagon's Joint Task Force Guantanamo, headquartered at Guantanamo Bay Naval Base. The documents are marked "secret" and NOFORN (information that is not to be shared with representatives of other countries).
Media reports on the documents note that more than 150 innocent Afghans and Pakistanis, including farmers, chefs, and drivers, were held for years without charges. The documents also reveal that some of the prison's youngest and oldest detainees, who include Mohammed Sadiq, an 89-year-old man, and Naqib Ullah, a 14-year-old boy, suffered from fragile mental and physical conditions. The files contain statements from Khalid Sheikh Mohammed, the planner of the 9/11 attacks, who said that al-Qaeda possessed nuclear capacity and would use it to retaliate for any attack on Osama bin Laden. The files also reveal the fate of wanted terrorist Mustafa Mohammed Fadhil, who had been quietly removed from the FBI's most wanted terrorists list in 2005.
The United States Department of Justice (DOJ) said the documents remained legally classified despite the leaks. It informed the lawyers who represent the prisoners in Guantanamo that they were not allowed to read the documents, which have been published by the New York Times and other major media outlets.