Ammar al-Baluchi or Amar al-Balochi is a Pakistani citizen who has been in American custody at the Guantanamo Bay detention camp since 2006. He was arrested in the Pakistani city of Karachi in 2003 before being transferred; the series of criminal charges against him include: "facilitating the 9/11 attackers, acting as a courier for Osama bin Laden and plotting to crash a plane packed with explosives into the U.S. consulate in Karachi." He is a nephew of the Pakistani terrorist Khalid Sheikh Mohammed, who served as a senior official of al-Qaeda between the late 1980s and early 2000s; and a cousin of the Pakistani terrorist Ramzi Ahmed Yousef, who played a key role in the 1993 World Trade Center bombing, the Philippine Airlines Flight 434 bombing, and the high-profile Bojinka plot.

The Guantanamo Bay detention camp is a United States military prison within the Guantanamo Bay Naval Base, also referred to as Gitmo, on the coast of Guantánamo Bay in Cuba. As of April 2023, of the 779 people detained there since January 2002 when the military prison first opened after the September 11 attacks, 740 had been transferred elsewhere, 30 remained there, and nine had died while in custody.