(Las) Tres Marias ("The Three Marys") could mean:
- The Brazilian municipality of Três Marias, in Minas Gerais
- Las Tres Marías (group), Ecuadorian musical trio
- Mexico's Islas Marías
- Panama's Las Tres Marías (Panama)
- Las Tres Marías is-- in Argentina, Brazil, Chile, Peru, Uruguay, and the Philippines-- the common name for the three stars in the "Belt of Orion" in the "Orion" constellation.
- A commonly-used name to describe the three 90s telenovelas starring Thalía: Maria Mercedes, Marimar, and Maria la del Barrio