The United States ambassador to the United Nations is the leader of the U.S. delegation, the U.S. Mission to the United Nations. The position is formally known as the permanent representative of the United States of America to the United Nations, with the rank and status of ambassador extraordinary and plenipotentiary, and representative of the United States of America in the United Nations Security Council. The deputy ambassador assumes the duties of the ambassador in their absence. As with all United States ambassadors, the ambassador to the UN and the deputy ambassador are both nominated by the president of the United States and confirmed by the Senate. The ambassador serves at the pleasure of the President. The ambassador may be assisted by one or more appointed delegates, often appointed for a specific purpose or issue. The U.S. permanent representative is charged with representing the United States on the UN Security Council, and during all plenary meetings of the General Assembly, except when a more senior officer of the United States (such as the secretary of state or the president of the United States) is in attendance. Despite their title head of external mission, the United States ambassador to the United Nations is also responsible for importing United Nations policies and motions voted in the main organs of the United Nations onto the national territory. The current ambassador is Linda Thomas-Greenfield, who was nominated by President Joe Biden and confirmed by the Senate on February 23, 2021. After winning the 2024 United States presidential election, Donald Trump announced that he will nominate Elise Stefanik, who is currently serving in the United States House of Representatives to be the next U.S. Ambassador to the United Nations in his second term.

Cabinet status

Henry Cabot Lodge Jr., a leading moderate Republican who lost his seat in the United States Senate to John F. Kennedy in the 1952 elections, was appointed ambassador to the United Nations in 1953 by Dwight D. Eisenhower in gratitude for the defeated senator's role in the new president's defeat of conservative leader Robert A. Taft for the 1952 Republican nomination and subsequent service as his campaign manager in the general election; Eisenhower raised the ambassadorship to Cabinet rank in order to give Lodge direct access to him without having to go through the State Department. The ambassadorship continued to hold this status throughout the remainder of the Cold War but was removed from Cabinet rank by George H. W. Bush, who had previously held the position himself. It was restored under the Clinton administration. It was not a Cabinet-level position under the George W. Bush administration (from 2001 to 2009), but was once again elevated under the Obama administration, and initially retained as such by the Trump administration during the tenure of Nikki Haley. However, in December 2018, it was reported by several news organizations that the Trump administration would once again downgrade the position to non-Cabinet rank. The position was again elevated to Cabinet rank in the Biden administration. Former UN ambassador and national security advisor John R. Bolton has publicly opposed the granting of Cabinet-level status to the office, stating "One, it overstates the role and importance the U.N. should have in U.S. foreign policy, second, you shouldn't have two secretaries in the same department".

List of ambassadors

Status The following is a chronological list of those who have held the office:

List of deputy ambassadors

The United States deputy ambassador to the United Nations serves as the second most senior American diplomat before the United Nations General Assembly and the Security Council in New York and carries the diplomatic rank of ambassador extraordinary and plenipotentiary. In the absence of the ambassador, the deputy serves in their place. †These deputy ambassadors later served as full U.S. ambassador to the United Nations position (see above).

List of deputies to the ambassador

The Deputy to the Ambassador to the UN is a separate position from the Senate-confirmed role of Deputy Ambassador to the United Nations. The deputy to the ambassador assists the U.S. ambassador to the UN by acting as a liaison in Washington, D.C., managing their Washington office, interacting with Congress and acting as a stand-in for the UN ambassador. The two roles co-exist, as in 2019 when Taryn Frideres was Deputy to the Ambassador at the same time that Jonathan Cohen was Deputy Ambassador to the UN.