The Bureau of Diplomatic Security (DS) is the security and law enforcement arm of the U.S. Department of State. DS is a world leader in international investigations, threat analysis, cyber security, counterterrorism, security technology, and protection of people, property, and information.

The Bureau is responsible for providing a safe and secure environment for the conduct of U.S. foreign policy. Every diplomatic mission in the world operates under a security program designed and maintained by Diplomatic Security. In the United States, Diplomatic Security personnel protect the Secretary of State and high-ranking foreign dignitaries and officials visiting the United States, investigates passport and visa fraud, and conducts personnel security investigations. Operating from a global platform in 31 U.S. cities and more than 160 foreign countries, DS ensures that America can conduct diplomacy safely and securely. DS plays a vital role in protecting 275 U.S. diplomatic missions and their personnel overseas, securing critical information systems, investigating passport and visa fraud, and fighting the war on terror.