| Post: | Secretary of Foreign Affairs |
| Body: | the United Mexican States |
| Native Name: | Spanish; Castilian: Secretario de Relaciones Exteriores de México |
| Insignia: | Seal of the Government of Mexico.svg |
| Insigniasize: | 100px |
| Insigniacaption: | Seal of the Government of Mexico |
| Incumbent: | Alicia Bárcena |
| Incumbentsince: | 3 July 2023 |
| Department: | Secretariat of Foreign Affairs |
| Member Of: | Cabinet of Mexico |
| Reports To: | President of Mexico |
| Appointer: | President of Mexico |
| Formation: | 8 November 1821 |
| First: | José Manuel de Herrera |
The secretary of foreign affairs (Spanish; Castilian: Secretaria de Relaciones Exteriores) is the foreign secretary of Mexico, responsible for implementing the country's foreign policy. The secretary is appointed by the president of Mexico to head the Secretariat of Foreign Affairs (Spanish; Castilian: links=no|Secretaría de Relaciones Exteriores) and is a member of the federal executive cabinet. The secretary is commonly referred to as Canciller (Spanish for Chancellor) in Mexico.