How to Say "questionnaire" in Spanish
The most common Spanish word for “questionnaire” is “cuestionario” — use 'cuestionario' when you are referring to a list of questions designed to gather opinions, feedback, or information, especially in surveys, research, or studies.
cuestionario
kwes-tyo-NA-ryokwestjoˈnaɾjo

Examples
Completamos un cuestionario para evaluar la calidad del servicio.
We completed a questionnaire to evaluate the quality of the service.
Por favor, rellena este cuestionario de satisfacción.
Please fill out this satisfaction questionnaire.
El profesor preparó un cuestionario sobre la historia de España.
The teacher prepared a quiz about the history of Spain.
Los datos fueron obtenidos a través de un cuestionario anónimo.
The data was obtained through an anonymous survey.
It's a masculine noun
Even though it ends in '-o', which is usually a male-sounding ending, just remember to always use 'el' or 'un' with it (el cuestionario).
One word for many meanings
In English, you might say 'quiz,' 'survey,' or 'form.' In Spanish, 'cuestionario' covers almost any written set of questions.
Confusing 'pregunta' and 'cuestionario'
Mistake: “Hice una cuestionario.”
Correction: Hice un cuestionario (or 'Hice una pregunta' if it was just one question). Use 'cuestionario' when there is a list of questions, and remember it is masculine.
formulario
for-moo-LAH-ryohfoɾmuˈlaɾjo

Examples
Necesito rellenar este formulario para solicitar la beca.
I need to fill out this form to apply for the scholarship.
Tienes que rellenar este formulario para abrir una cuenta.
You have to fill out this form to open an account.
He enviado el formulario de contacto por internet.
I have sent the contact form online.
Gender Identification
Since this word ends in '-o', it is masculine. You should always use 'el' or 'un' with it: 'el formulario'.
The 'Fill Out' Confusion
Mistake: “Using 'llenar' exclusively for forms.”
Correction: While 'llenar' works, Spanish speakers more naturally use 'rellenar' (to fill in) or 'completar' (to complete) when talking about documents.
Formulario vs. Cuestionario
Related Translations
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