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The United States Department of State (DOS), commonly referred to as the State Department, is the federal executive department that advises the President and conducts international relations. Equivalent to the foreign ministry of other countries, it was established in 1789 as the nation's first executive department. The current Secretary of State is Mike Pompeo, who ascended to the office in April 2018 after Rex Tillerson resigned.

The State Department's duties include implementing the foreign policy of the United States, operating the nation's diplomatic missions abroad, negotiating treaties and agreements with foreign entities, and representing the United States at the United Nations. It is led by the Secretary of State, a member of the Cabinet who is nominated by the President and confirmed by the Senate. In addition to administering the department, the Secretary of State serves as the nation's chief diplomat and representative abroad. The Secretary of State is the first Cabinet official in the order of precedence and in the presidential line of succession, after the Vice President of the United States, Speaker of the House of Representatives, and President pro tempore of the Senate.

The State Department is headquartered in the Harry S Truman Building, a few blocks away from the White House, in the Foggy Bottom neighborhood of Washington, D.C.; "Foggy Bottom" is thus sometimes used as a metonym.