List of ambassadors of the United States to the United Nations

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 position in the ambassador's 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 the 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 most recent ambassador is Linda Thomas-Greenfield, who was nominated by President Joe Biden and confirmed by the Senate on February 23, 2021.

Following his presidential inauguration, Donald Trump formally nominated 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. Trump withdrew the nomination on March 27, 2025. On May 1, 2025, Trump announced via social media that he intended to nominate Mike Waltz to serve as the next U.S. ambassador to the UN.