Secretariat of the Navy
| Secretaría de Marina | |
| Secretary of the Navy logo | |
| Agency overview | |
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| Jurisdiction | Federal government of Mexico | 
| Agency executive | 
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| Website | www | 
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. The secretary is appointed by the President of Mexico.