Cuál (Which One)

¿Cuál? (plural ¿cuáles?) is the Spanish question word for which one / which ones. It is the word you reach for when the speaker is asking the listener to select one option from an implied set.

Basic use: cuál + ser

The prototypical pattern is ¿Cuál es…? — Which is…? It is extremely common in Spanish, much more so than English which suggests.

Notice that English uses what here, while Spanish uses cuál. This is the single most important contrast for English speakers learning Spanish questions. When there is a defined set of possible answers — all books, all phone numbers, all colors — Spanish prefers cuál.

Cuál vs. qué — the key contrast

Compare the two most common patterns:

The first asks for a dictionary-style definition. The second assumes there are several tamales on a table and wants to know which belongs to you.

Cuál is rarely used before a noun

In standard written Latin American Spanish, cuál is almost never placed directly before a noun. Use qué + noun instead.

In casual speech across Mexico, Colombia, and other parts of Latin America you will hear ¿cuál libro? fairly often, and it is understood. But if you want one reliable rule, it is: before a noun, use qué. See qué for more.

Cuál as a standalone pronoun

When cuál is not followed by a noun, it acts as a pronoun and stands alone.

This is the classic "picking one from a group" situation — and cuál is perfect for it.

Cuál with prepositions

Cuál and cuáles follow prepositions just like other question words.

Quick rule of thumb

• Definition → qué
• Before a noun → qué
• Selection from a set → cuál / cuáles
• What's your name/number/address? → ¿Cuál es…?