Assistant Secretary of State for Western Hemisphere Affairs
The Assistant Secretary of State for Western Hemisphere Affairs is the head of the Bureau of Western Hemisphere Affairs within the United States Department of State, the foreign affairs department of the United States federal government. The Assistant Secretary of State guides operation of the U.S. diplomatic establishment in the countries of the Western Hemisphere and advises the Secretary of State and the Under Secretary for Political Affairs.
The Department of State created the position of Assistant Secretary of State for American Republic Affairs during the general reorganization of December 20, 1944, after Congress had authorized an increase in the number of Assistant Secretaries of State from four to six. This reorganization was the first to assign substantive designations to specific Assistant Secretary positions. The position was temporarily discontinued between June 1947 and June 1949, when American Republic Affairs were handled by an Assistant Secretary for Political Affairs.
The Department re-established the position in June 1949 after the Commission on Organization of the Executive Branch of Government recommended that certain offices be upgraded to bureau level and after Congress increased the number of Assistant Secretaries of State from six to ten. On October 3, 1949, the Department by administrative action changed the incumbent's designation to Assistant Secretary for Inter-American Affairs. The Department of State had first established a Division of Latin American Affairs in 1909.
List of Assistant Secretaries of State for American Republic Affairs, 1944–1947
List of Assistant Secretaries of State for Inter-American Affairs, 1949–2000
List of Assistant Secretaries of State for Western Hemisphere Affairs, 2000–present
| Name | Assumed Office | Left Office | President served under |
| Peter F. Romero | January 4, 2001 | June 4, 2001 | Bill Clinton and George W. Bush |
| Otto Reich | January 11, 2002 | July 22, 2004 | George W. Bush |
| Roger Noriega | July 31, 2004 | October 6, 2005 | George W. Bush |
| Thomas A. Shannon, Jr. | October 17, 2005 | November 5, 2009 | George W. Bush and Barack Obama |
| Arturo Valenzuela | November 10, 2009 | August 31, 2011 | Barack Obama |
| Roberta S. Jacobson | March 30, 2012 | May 5, 2016 | Barack Obama |
| Mari Carmen Aponte | May 5, 2016 | January 20, 2017 | Barack Obama |
| Francisco "Paco" Palmieri | January 20, 2017 | October 15, 2018 | Donald Trump |
| Kimberly Breier | October 15, 2018 | August 8, 2019 | Donald Trump |
| Michael Kozak | September 13, 2019 | Donald Trump |