Other
- San Marcos (León), former monastery in León
- USS San Marcos (LSD-25), a ship of the United States Navy
- National University of San Marcos, Peru
- "San Marcos", a fictional country in the 1971 motion picture Bananas
- San Marcos de Arica, Chilean football club
- FC San Marcos, Nicaraguan football club
- San Marcos High School, Santa Barbara, California, USA
- Castillo de San Marcos, the oldest surviving masonry fort in the United States
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