The secretary of foreign affairs (Spanish: Secretario 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: Secretaría de Relaciones Exteriores) and is a member of the federal executive cabinet.

The secretary is commonly referred to in Spanish as Canciller ("Chancellor").

The incumbent secretary, since 1 October 2024, is Juan Ramón de la Fuente.

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