United States Ambassador to Mexico List of ambassadors List of ambassadors

| Representative | Title | From_ | To_ | Appointed_by_ |
|---|---|---|---|---|
| Gilbert L. Thompson | Special Diplomatic Agent | 1844 |  | John Tyler |
| Wilson Shannon | Minister | 1844 | 1845 | John Tyler |
| John Slidell | Minister | 1845 |  | James K. Polk |
| David Conner | Special Diplomatic Agent | 1846 |  | James K. Polk |
| Nathan Clifford | Minister | 1848 | 1849 | James K. Polk |
| Robert P. Letcher | Minister | 1849 | 1852 |  |
| Robert Greenhow | Special Diplomatic Agent | 1850 |  |  |
| George G. Goss | Special Diplomatic Agent | 1850 | 1852 |  |
| George W. Slacum | Special Diplomatic Agent | 1851 |  | Millard Fillmore |
| Edward Smith | Special Diplomatic Agent | 1852 |  | Millard Fillmore |
| Alfred Conkling | Minister | 1852 | 1853 | Millard Fillmore |
| George E. Cooper | Special Diplomatic Agent | 1853 |  |  |
| Christopher L. Ward | Special Diplomatic Agent | 1853 |  |  |
| James Gadsden | Minister | 1853 | 1856 |  |