How to Say "mystery" in Spanish
The Spanish word for “mystery” is “misterio” — A1 level. This is a very common word in everyday Spanish.

Examples
¿Quién se comió el último trozo de pastel? ¡Es un misterio!
Who ate the last piece of cake? It's a mystery!
El detective resolvió el misterio del collar robado en solo dos días.
The detective solved the mystery of the stolen necklace in only two days.
Para mí, cómo funciona el internet sigue siendo un completo misterio.
For me, how the internet works is still a complete mystery.
Gender Rule
Even though many Spanish nouns ending in -a are feminine, 'misterio' ends in -o and is masculine. Always use the masculine article: 'el misterio', 'un misterio'.
Mixing up 'misterio' and 'secreto'
Mistake: “Usar 'misterio' cuando se refiere a información personal oculta.”
Correction: 'Misterio' usually refers to a puzzle or a general unknown truth (like the universe). Use 'secreto' for personal, hidden information (e.g., 'Tengo un secreto').
Other Meanings of “misterio”
“misterio” can also mean:
- a religious truth that cannot be fully explained(B2, formal)
Related Translations
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