How to Say "proprietor" in Spanish
The most common Spanish word for “proprietor” is “dueño” — use 'dueño' when referring to the owner of a business, company, or any possession, as it is the most common and general term..
dueño
Examples
¿Quién es el dueño de este coche rojo?
Who is the owner of this red car?
propietario
pro-pyeh-TAHR-ee-oh/pɾopjetaˈɾjo/

Examples
El propietario del coche nuevo vive en el tercer piso.
The owner of the new car lives on the third floor.
Necesitas hablar con el propietario del restaurante sobre la reserva.
You need to speak with the proprietor of the restaurant about the reservation.
Los inquilinos se quejaron al propietario por el ruido.
The tenants complained to the landlord about the noise.
Gender Change
Since this word ends in '-o', it changes to '-a' for women: 'la propietaria' (the female owner). This is a standard pattern for Spanish nouns describing people.
Confusing Formality
Mistake: “Using 'propietario' in very casual talk about small items.”
Correction: For casual contexts, especially simple possessions, use 'dueño'. Use 'propietario' for official or formal ownership (houses, companies).
Choosing between 'dueño' and 'propietario'
Related Translations
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