Ana Belén Montes (born February 28, 1957) is a former American senior analyst at the Defense Intelligence Agency in the United States who spied on behalf of the Cuban government for 17 years.

[3] Prior to her arrest, she lived in a two-bedroom co-op apartment in the Cleveland Park neighborhood of Washington, D.C.[3] Montes advanced rapidly through the ranks at the DIA and became its most senior Cuban analyst.

She became known to other students for her strong opinions in support of left-wing Latin American movements like the Sandinista National Liberation Front in Nicaragua.

In addition, Montes communicated by coded numeric pager messages with the Cuban Intelligence Service by public telephones located in the District of Columbia and Maryland.

During the course of the investigation against her, it was determined that Montes passed a considerable amount of classified information to the Cuban Intelligence Directorate, including the identities of four U.S. spies in Cuba.

In 2007, American DIA counterintelligence official Scott W. Carmichael publicly alleged that it was Ana Montes who told Cuban intelligence officers about a clandestine U.S. Army camp in El Salvador.

[8] Carmichael characterized the damage that Montes caused to the DIA and other U.S. intelligence agencies as "exceptionally grave," and stated that she compromised a "special-access program" that was kept secret even from him, the lead investigator on her case.

[3] At the sentencing hearing, Montes described U.S. policy towards Cuba as cruel and unfair and said "I felt morally obligated to help the island defend itself from our efforts to impose our values and our political system on it".

[10][11] After pleading guilty, Montes told CIA debriefers that she desired to protect Cuba from the United States and that she believed that "all the world is one country.

[3] FMC Carswell is listed by the Federal Bureau of Prisons as a facility located in the northeast corner of the Naval Air Station, Joint Reserve Base, Fort Worth, which provides specialized medical and mental health services to female offenders.