|United States Ambassador to the European Union|
July 22, 2008 – January 18, 2009
|President||George W. Bush|
|Preceded by||C. Boyden Gray|
|Succeeded by||William Kennard|
|Assistant Secretary of State for International Organization Affairs|
August 2, 2005 – June 27, 2008
|President||George W. Bush|
|Preceded by||Kim Holmes|
|Succeeded by||Brian H. Hook|
Kristen Silverberg (born 1970 or 1971) was the United States Ambassador to the European Union from July 2008 until January 2009. She was nominated by President George W. Bush on April 24, 2008 and confirmed by the United States Senate on June 27, 2008. On July 22, 2008, she presented her credentials. She was succeeded by William Kennard who was nominated by President Barack Obama on August 6, 2009 and confirmed by the United States Senate on November 20, 2009.
Silverberg was previously Assistant Secretary of State for International Organization Affairs for the United States government. In that role, she was in charge of the Bureau of International Organization Affairs, a part of the State Department.
Prior to her appointment to the State Department, Silverberg served in the following positions in the White House:
- Special Assistant to the President in the Office of the Chief of Staff
- Deputy Assistant to the President for Domestic Policy
- Deputy Assistant to the President and Advisor to the Chief of Staff 
Silverberg also served as Senior Adviser to Paul Bremer when he was Administrator of the Coalition Provisional Authority in Iraq—reportedly "because she was interested in the work, and not at the behest of the White House." She has been described as a "rising star" in the White House, and as "one of the White House's most trusted behind-the-scenes aides." 
Silverberg was born in 1970 or 1971 in Alpine, Texas to Rhoda and Eric Silverberg. Silverberg is a graduate of Harvard University and The University of Texas School of Law (1996). She wrote an article (PDF) in 2002 encouraging fellow alumni to seek legal careers in government. Silverberg is Jewish and a strong supporter of Israel. 
On May 24, 2008 she married Paul V. Lettow at the Lady Bird Johnson Wildflower Center in Austin, Texas; Lettow is the son of Charles F. Lettow, who since July 2003 has been a judge of the U.S. Court of Federal Claims.
- Kristen Silverberg, Paul Lettow, a May 2008 wedding announcement from The New York Times
- "Kristen Silverberg". State.gov. Retrieved June 24, 2016.
- "Kristen Silverberg, Assistant Secretary, Bureau of International Organization Affairs, Department of State". 2002-2009-fpc.state.gov. Retrieved November 10, 2016.
- Biography of Kristen Silverberg from the White House website
- Bush Concerned by Iraq Looting, but Confident in Plan from The Washington Post
- Iraq Hits a Flashing Red Light from The Washington Post
- "Archived copy". Archived from the original on July 16, 2014. Retrieved June 16, 2014.
- U.S. Ambassador to the EU Kristen Silverberg[permanent dead link] from the website of the U.S. Mission to the European Union
- Biography of Charles F. Lettow Archived July 11, 2013, at the Wayback Machine. from the website of the U.S. Court of Federal Claims
C. Boyden Gray
| United States Ambassador to the European Union
Kim R. Holmes
| Assistant Secretary of State
for International Organization Affairs
Brian H. Hook