The Central Intelligence Agency (CIA; ) is a civilian foreign intelligence service of the federal government of the United States tasked with advancing national security through collecting and analyzing intelligence from around the world and conducting covert operations. The agency is headquartered in the George Bush Center for Intelligence in Langley, Virginia, and is sometimes metonymously called "Langley". A major member of the United States Intelligence Community (IC), the CIA has reported to the director of national intelligence since 2004, and is focused on providing intelligence for the president and the Cabinet.

The CIA is headed by a director and is divided into various directorates, including a Directorate of Analysis and Directorate of Operations. Unlike the Federal Bureau of Investigation (FBI), the CIA has no law enforcement function and focuses on intelligence gathering overseas, with only limited domestic intelligence collection. The CIA is responsible for coordinating all human intelligence (HUMINT) activities in the IC. It has been instrumental in establishing intelligence services in many countries, and has provided support to many foreign organizations. The CIA exerts foreign political influence through its paramilitary operations units, including its Special Activities Center. It has also provided support to several foreign political groups and governments, including planning, coordinating, training and carrying out torture, and technical support. It was involved in many regime changes and carrying out terrorist attacks and planned assassinations of foreign leaders.

During World War II, U.S. intelligence and covert operations had been undertaken by the Office of Strategic Services (OSS).