How to Say "sir" in Spanish
The most common Spanish word for “sir” is “señor” — use 'señor' as a general and very common way to address a man directly, especially when you know his last name or as a polite, neutral term..
señor
Examples
¿El señor López está en la oficina?
Is Mr. López in the office?
caballero
/kah-bah-YEH-roh//ka.βaˈʎe.ɾo/

Examples
Disculpe, caballero, ¿sabe dónde está el baño?
Excuse me, sir, do you know where the restroom is?
Esperamos a un caballero que lleva un sombrero rojo.
We are waiting for a gentleman who is wearing a red hat.
Masculine Noun
Since this word ends in '-o', it is always masculine, referring only to men. The female equivalent is 'dama' (lady).
Using 'caballero' too informally
Mistake: “Using 'caballero' with a friend in casual conversation.”
Correction: This word is polite, use 'amigo' (friend) or just their name in informal settings.
don
/don//don/

Examples
Buenos días, don Carlos.
Good morning, Don Carlos.
Mi abuelo, don José, era un hombre muy sabio.
My grandfather, Don José, was a very wise man.
Le presento a don Miguel, el director de la empresa.
I'd like to introduce you to Don Miguel, the company director.
How to Use 'Don'
Always use 'don' right before a man's first name, like 'don Alberto'. Never use it with just the last name. For the last name, you would use 'señor', like 'señor García'.
Using 'Don' with a Last Name
Mistake: “Hola, don Martínez.”
Correction: Hola, don Carlos. OR Hola, señor Martínez. Remember, 'don' goes with the first name, and 'señor' goes with the last name.
monsieur
/mon-siúr//monˈsjeɾ/

Examples
El famoso 'monsieur' de la novela llegó tarde a la cita.
The famous 'Mr.' from the novel arrived late for the appointment.
Disculpe, monsieur, ¿sabe dónde está la embajada?
Excuse me, sir (French), do you know where the embassy is?
Se comporta como un verdadero monsieur, siempre con guantes y sombrero.
He behaves like a true gentleman (French style), always with gloves and a hat.
A Borrowed Word
Since 'monsieur' is a direct borrowing from French, it doesn't change its form in Spanish (it's invariable). You only use 'el' or 'un' before it.
Using it as a Standard Title
Mistake: “Using 'monsieur' instead of 'señor' when addressing a Spanish speaker.”
Correction: Only use 'monsieur' when referring specifically to a French person or in a literary context. Use 'Señor' for everyone else.
Señor vs. Caballero
Related Translations
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