Spanish, like English, has two kinds of relative clauses: those that identify the antecedent (restrictive: the sister who lives in Madrid — implying there are other sisters) and those that add an aside about an already-identified antecedent (non-restrictive: my sister, who lives in Madrid, ... — there is only one sister, and we're tossing in extra information). In Spanish, the entire distinction rides on a pair of commas. Get the commas wrong and you change who you're talking about.
This page is about the non-restrictive type — the ones with commas. We'll cover which pronouns are available, when each is preferred, and why the comma is not optional.
The comma is the rule
The single most important fact about non-restrictive relatives in Spanish is that the comma is obligatory, on both sides of the clause (unless the clause ends the sentence, in which case the closing comma is replaced by the full stop). The comma is not a stylistic flourish; it is the orthographic marker that tells the reader "what follows is parenthetical, not defining."
Mi hermana, que vive en Madrid, viene mañana a verme.
My sister, who lives in Madrid, is coming to see me tomorrow.
El profesor Ramírez, a quien conocí en Salamanca, ha publicado un libro nuevo.
Professor Ramírez, whom I met in Salamanca, has published a new book.
Drop the commas and you change the meaning entirely. We'll see that contrast in a moment.
How the comma rewrites the meaning
Compare these two sentences. They differ only in punctuation, and yet they imply completely different family situations.
Mi hermana que vive en Madrid viene mañana.
My sister who lives in Madrid is coming tomorrow. (restrictive — implies I have more than one sister, and the one from Madrid is the one coming)
Mi hermana, que vive en Madrid, viene mañana.
My sister, who lives in Madrid, is coming tomorrow. (non-restrictive — I have one sister, and she happens to live in Madrid)
In the first version, the relative clause restricts the reference: out of several sisters, the one from Madrid. In the second, the relative clause is an aside about an already-identified sister. English makes the same distinction with commas, but English speakers often punctuate looser than Spanish allows. In Spanish, the punctuation is a grammatical signal, not a stylistic preference.
Pronoun choices in non-restrictive clauses
Non-restrictive relatives accept a wider range of pronouns than restrictive ones. Here's the inventory you'll meet most often.
| Pronoun | Antecedent | Register | Typical use |
|---|---|---|---|
| que | people or things | neutral | the default for almost any non-restrictive clause |
| quien / quienes | people only | neutral to formal | preferred for people in non-restrictive, especially after a comma |
| el cual / la cual / los cuales / las cuales | people or things | formal, more frequent in writing | used when disambiguation is needed, or in formal registers |
| lo cual | a whole clause or abstract idea | neutral to formal | commenting on what the previous clause just said |
Que — the workhorse
Que works in nearly every non-restrictive context. It can refer to people or things and serves as either subject or object of its clause.
Mi vecino, que es jubilado, riega las plantas cuando nos vamos de vacaciones.
My neighbour, who is retired, waters the plants when we go on holiday.
El móvil, que me costó un dineral, se ha roto al cabo de un mes.
My phone, which cost me a fortune, broke after a month.
Quien / quienes — preferred for people in non-restrictive contexts
When the antecedent is a person and the clause is non-restrictive, many speakers (and most editors) prefer quien or quienes over que. It is not wrong to use que here; quien simply sounds slightly more elegant.
Mi tía Marisa, quien lleva treinta años viviendo en Barcelona, vuelve a Sevilla este verano.
My aunt Marisa, who has been living in Barcelona for thirty years, is moving back to Seville this summer.
Los Pérez, quienes nos invitaron a cenar el sábado, acaban de comprarse un piso en Chamberí.
The Pérezes, who invited us to dinner on Saturday, have just bought a flat in Chamberí.
Note: quien in restrictive clauses without commas is much rarer in modern peninsular Spanish (La mujer quien me lo dijo sounds odd; speakers prefer La mujer que me lo dijo). Quien is most at home in the non-restrictive slot.
El cual / la cual / los cuales / las cuales — the formal option
The el cual family is the formal counterpart of que. You'll see it in journalism, academic writing, legal prose, and elevated speech. It agrees in gender and number with its antecedent, which makes it useful for disambiguation when there are two candidate antecedents.
El director de la empresa, el cual lleva más de veinte años en el cargo, ha anunciado su jubilación.
The company's director, who has held the post for over twenty years, has announced his retirement. (formal)
La hermana de Pablo, la cual estudia medicina, ganó una beca para Heidelberg.
Pablo's sister, who studies medicine, won a scholarship to Heidelberg. (la cual unambiguously refers to la hermana, not Pablo)
In ordinary conversation, el cual sounds overly formal — even pretentious. Save it for written or formal contexts.
Lo cual — for whole-clause antecedents
Spanish has a dedicated neuter relative for when the "antecedent" is not a noun but a whole clause or an abstract idea. English uses which here too — "It rained all day, which ruined the picnic" — but English speakers often miss that Spanish carves out a separate form for this.
Llovió todo el día, lo cual estropeó el picnic que teníamos preparado.
It rained all day, which ruined the picnic we had planned.
El tren llegó con tres horas de retraso, lo cual nos hizo perder la reunión.
The train arrived three hours late, which made us miss the meeting.
Lo que also works in this slot and is more conversational; lo cual is slightly more formal.
Se negó a firmar el contrato, lo que sorprendió a todo el mundo.
He refused to sign the contract, which surprised everyone.
In writing and careful speech, lo cual and lo que are interchangeable in this clausal-antecedent role. The only thing to avoid is bare que with a clausal antecedent — Llovió todo el día, que estropeó el picnic — which sounds wrong because que needs a nominal antecedent.
Non-restrictive after a preposition
When a non-restrictive clause begins with a preposition, peninsular Spanish strongly prefers the el cual family (or quien for people) over bare que. This is one of the places where the formal pronouns earn their keep.
Mis padres, con los cuales sigo viviendo, me apoyan en todo.
My parents, with whom I still live, support me in everything.
Mi jefa, para quien trabajo desde hace cinco años, se jubila el mes que viene.
My boss, for whom I've worked for five years, is retiring next month.
El edificio, en el cual vivieron mis abuelos, va a ser demolido.
The building, in which my grandparents lived, is going to be demolished.
After short, common prepositions (con, en, de, por, a), the el que family is also acceptable in modern peninsular speech: mis padres, con los que sigo viviendo. The fully formal el cual version is the safest in writing.
Comparing with English: there's no that-vs-which split
If you've been taught English grammar carefully, you may have learned that that is restrictive and which is non-restrictive: The book that I read (restrictive) vs The book, which I read, ... (non-restrictive). Some style guides even forbid which in restrictive clauses.
Spanish has no such rule. Que is happy in both restrictive and non-restrictive clauses; the comma alone signals the distinction. There is no Spanish equivalent of the that vs which etiquette war.
El libro que estoy leyendo es buenísimo.
The book (that) I'm reading is excellent. (restrictive — no commas)
Cien años de soledad, que estoy leyendo por tercera vez, sigue sorprendiéndome.
One Hundred Years of Solitude, which I'm reading for the third time, keeps surprising me. (non-restrictive — commas)
Same que, two different functions, told apart by the commas.
The closing comma — easy to forget
English allows a closing parenthetical comma to be replaced by a dash or even (sometimes) omitted in casual writing. Spanish is stricter: if you opened the parenthetical with a comma, you must close it with a comma (or a full stop if the clause ends the sentence).
Mi prima Lucía, que ahora vive en Bilbao, viene a verme este fin de semana.
My cousin Lucía, who now lives in Bilbao, is coming to see me this weekend. (two commas — opening and closing)
Anoche cené con mi prima Lucía, que ahora vive en Bilbao.
Last night I had dinner with my cousin Lucía, who now lives in Bilbao. (one comma — the full stop closes the clause)
Forgetting the second comma is one of the most common punctuation errors among learners — and among native writers in a hurry.
A subtler case: ambiguity that punctuation resolves
Consider this pair, which differs only in commas:
Los estudiantes que no han hecho los deberes se quedarán en clase.
The students who haven't done their homework will stay in class. (restrictive — only those students; the rest can leave)
Los estudiantes, que no han hecho los deberes, se quedarán en clase.
The students, who haven't done their homework, will stay in class. (non-restrictive — all the students, and by the way none of them did the homework)
A teacher writing the first sentence is keeping a subset behind; a teacher writing the second is keeping everyone behind because nobody did the homework. The difference between these two situations is, in Spanish prose, exactly two commas.
Common Mistakes
❌ Mi hermana que vive en Madrid viene mañana, es la única que tengo.
Wrong — if you have only one sister, the clause is non-restrictive and needs commas.
✅ Mi hermana, que vive en Madrid, viene mañana; es la única que tengo.
My sister, who lives in Madrid, is coming tomorrow; she's the only one I have.
❌ Llovió todo el día, que estropeó el picnic.
Wrong — bare 'que' cannot take a whole clause as antecedent; use 'lo cual' or 'lo que'.
✅ Llovió todo el día, lo cual estropeó el picnic.
It rained all day, which ruined the picnic.
❌ Mi vecino, que vive enfrente es jubilado.
Wrong — the non-restrictive clause needs a closing comma as well as an opening one.
✅ Mi vecino, que vive enfrente, es jubilado.
My neighbour, who lives across the street, is retired.
❌ Mis padres, con que sigo viviendo, son muy comprensivos.
Wrong — after a preposition in a non-restrictive clause, peninsular Spanish requires 'los cuales', 'quienes', or at minimum 'los que'.
✅ Mis padres, con los cuales sigo viviendo, son muy comprensivos.
My parents, with whom I still live, are very understanding.
❌ El director, el cual es muy majo, nos invitó a una cerveza después del trabajo.
Not wrong, but jarringly formal for a casual context — 'el cual' clashes with 'majo' and 'una cerveza'.
✅ El director, que es muy majo, nos invitó a una cerveza después del trabajo.
The boss, who's really nice, invited us out for a beer after work.
Key takeaways
- Non-restrictive relative clauses sit between commas. The commas are grammatical, not stylistic.
- Que is the default pronoun and works in nearly all non-restrictive contexts. Quien/quienes is slightly preferred for people in writing and careful speech.
- El cual / la cual / los cuales / las cuales is the formal option, especially useful for disambiguation and after prepositions.
- Lo cual (or lo que) is required when the "antecedent" is a whole clause rather than a specific noun.
- Spanish has no that vs which rule — both restrictive and non-restrictive clauses can use que. The commas do the work that the English pronoun choice does.
- Always close the parenthetical: opening comma + closing comma (or full stop if the clause ends the sentence).
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Start learning Spanish→Related Topics
- Cláusulas relativas: guía completaB1 — A comprehensive reference of every Spanish relative pronoun — que, quien, el que, el cual, lo que/lo cual, cuyo, donde, cuando, como, cuanto — with register, antecedent type, and decision logic.
- Relativas con preposicionesB1 — When the relative pronoun is the object of a preposition, Spanish keeps the preposition adjacent to the pronoun — no dangling prepositions, ever — and the choice of pronoun depends on the antecedent and the register.
- Subjuntivo en cláusulas relativasB2 — Spanish relative clauses pick indicative when the antecedent is real and known, and subjunctive when it's hypothetical, sought, or denied — a contrast that carries genuine semantic weight.
- Cuyo en cláusulas complejasB2 — Cuyo is Spanish's possessive relative pronoun — it agrees with the possessed noun, not the antecedent, and lives almost entirely in formal writing.