Mariel may refer to:
- Mariel (given name), given name.
- Mariel, Cuba, a municipality and city in Cuba.
- The Mariel boatlift, a 1980 exodus of Cubans to the United States.
- Mariel Hemingway, actress and granddaughter of Ernest Hemingway.
- Mariel Rodriguez, a Filipino host and an actress.
- Mari-El, an autonomous republic of Russia.
- Mariel of Redwall, a book in the Redwall series.
- El Mariel, second studio album by Cuban-American rapper Pitbull.