List of ambassadors of the United States to the United Nations International Organizations in Vienna

Ambassador of the United States to the United Nations International Organizations in Vienna
Seal of the United States Department of State
Incumbent Laura Holgate since February 1, 2022
United States Department of State
Nominator	President of the United States
Inaugural holder	Richard S. Williamson as Representative
Formation	1983
Website	U.S. Mission to the International Organizations in Vienna

The United States ambassador to the United Nations International Organizations in Vienna is the diplomatic representative of the United States to those organizations of the United Nations Office in Vienna.

Organizations include: the International Atomic Energy Agency, the Comprehensive Nuclear-Test-Ban Treaty Organization, the United Nations Office for Outer Space Affairs and the United Nations Office on Drugs and Crime, among others. The position is formally split into two permanent representative-level positions, titled United States Permanent Representative to the Vienna Office of the United Nations and United States Permanent Representative to the International Atomic Energy Agency, each of which requires a separate Senate confirmation. Because the representative holds the rank of an ambassador, they are commonly referred to by this title.

Representatives

U.S. diplomatic terms
Career FSO After 1915, The United States Department of State began classifying ambassadors as career Foreign Service Officers (FSOs) for those who have served in the Foreign Service for a specified amount of time. Political appointee A person who is not a career foreign service officer, but is appointed by the president (often as a reward to political friends). Appointed The date that the ambassador took the oath of office; also known as "commissioning". It follows confirmation of a presidential appointment by the Senate, or a Congressional recess appointment by the president. In the case of a recess appointment, the ambassador requires subsequent confirmation by the Senate to remain in office. Presented credentials The date that the ambassador presented his letter of credence to the head of state or appropriate authority of the receiving nation. At this time the ambassador officially becomes the representative of his country. This would normally occur a short time after the ambassador's arrival on station. The host nation may reject the ambassador by not receiving the ambassador's letter, but this occurs only rarely. Terminated mission Usually the date that the ambassador left the country. In some cases a letter of recall is presented, ending the ambassador's commission, either as a means of diplomatic protest or because the diplomat is being reassigned elsewhere and replaced by another envoy. Chargé d'affaires The person in charge of the business of the embassy when there is no ambassador commissioned to the host country. Ad interim Latin phrase meaning "for the time being", "in the meantime".

U.S. diplomatic terms

Career FSO
After 1915, The United States Department of State began classifying ambassadors as career Foreign Service Officers (FSOs) for those who have served in the Foreign Service for a specified amount of time.

Political appointee
A person who is not a career foreign service officer, but is appointed by the president (often as a reward to political friends).

Appointed
The date that the ambassador took the oath of office; also known as "commissioning". It follows confirmation of a presidential appointment by the Senate, or a Congressional recess appointment by the president. In the case of a recess appointment, the ambassador requires subsequent confirmation by the Senate to remain in office.

Presented credentials
The date that the ambassador presented his letter of credence to the head of state or appropriate authority of the receiving nation. At this time the ambassador officially becomes the representative of his country. This would normally occur a short time after the ambassador's arrival on station. The host nation may reject the ambassador by not receiving the ambassador's letter, but this occurs only rarely.

Terminated mission
Usually the date that the ambassador left the country. In some cases a letter of recall is presented, ending the ambassador's commission, either as a means of diplomatic protest or because the diplomat is being reassigned elsewhere and replaced by another envoy.

Chargé d'affaires
The person in charge of the business of the embassy when there is no ambassador commissioned to the host country.

Ad interim
Latin phrase meaning "for the time being", "in the meantime".

References from the State Department, unless otherwise indicated.

Richard S. Williamson – Political appointee
- Appointed: May 17, 1983
- Terminated mission: January 15, 1985
Bruce Chapman – Political appointee
- Appointed: August 1, 1985
- Terminated mission: October 16, 1988
Michael H. Newlin – Career FSO
- Appointed: August 12, 1988
- Terminated mission: September 6, 1991
John B. Ritch III – Political appointee
- Appointed: November 22, 1993
- Terminated mission: January 1, 2001
Kenneth C. Brill – Career FSO
- Appointed: October 1, 2001
- Terminated mission: June 29, 2004
Gregory Schulte – Political appointee
- Appointed: June 29, 2005
- Terminated mission: June 20, 2009
Glyn T. Davies – Career FSO
- Appointed: August 12, 2009
- Terminated mission: November 30, 2011
Joseph Macmanus – Career FSO
- Appointed: September 27, 2012
- Terminated mission: August 4, 2014
Laura Holgate – Political appointee
- Appointed: June 27, 2016
- Presentation of Credentials: July 18, 2016
- Termination of Mission: January 18, 2017
Jackie Wolcott – Political appointee
- Appointed: September 26, 2018
- Presentation of Credentials: October 23, 2018
- Termination of Mission: January 18, 2021
Laura Holgate - Political appointee
- Appointed (Vienna Office): December 18, 2021
- Presentation of Credentials (Vienna Office): February 1, 2022
- Appointed (IAEA): March 29, 2022
- Presentation of Credentials (IAEA): April 8, 2022