The Secretariat of the Navy (Spanish: Secretaría de Marina, SEMAR) is one of the twenty-one state secretariats of the government of Mexico.

It is in charge of designing, planning, executing and coordinating public policies related to the Mexican Navy.

The Secretary of the Navy is a member of the federal executive cabinet, as well as the highest-ranking Mexican naval officer with the responsibility of commanding the Mexican Navy, including the Mexican Marine Corps as well as the Mexican merchant marine service.

[2] Based on article 30 of the Organic Law of the Federal Public Administration, among other actions the Secretariat is mandated to:

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