After che (the workhorse) and cui (the prepositional specialist), Italian has a third relative pronoun: il quale — along with its inflected forms la quale, i quali, and le quali. Unlike its two cousins, this pronoun changes for gender and number to match its antecedent. It belongs to a different register — more formal, more careful, more often written than spoken — and it does jobs the other two cannot: above all, resolving ambiguity in dense sentences. This page lays out exactly when il quale is necessary, when it is optional, and when it sounds wrong.
The four forms
Because il quale is built from the definite article + quale, it inflects like an adjective:
| Antecedent | Form |
|---|---|
| Masculine singular | il quale |
| Feminine singular | la quale |
| Masculine plural | i quali |
| Feminine plural | le quali |
The inflection always agrees with the antecedent — the noun being described — not with anything in the relative clause itself. (This is the opposite of what happens in the possessive il cui construction, which agrees forward.)
Il professore, il quale insegna da trent'anni, va in pensione.
The professor, who has taught for thirty years, is retiring.
La professoressa, la quale insegna da trent'anni, va in pensione.
The professor (f), who has taught for thirty years, is retiring.
I professori, i quali hanno scritto una lettera, sono preoccupati.
The professors, who wrote a letter, are worried.
Le professoresse, le quali hanno scritto una lettera, sono preoccupate.
The professors (f), who wrote a letter, are worried.
The three real uses of il quale
In contemporary Italian, il quale is rarely chosen at random. It tends to appear in three specific situations.
Use 1: Formal and literary register
In legal documents, academic prose, journalistic writing, and literature, il quale signals careful, elevated style. Where ordinary speech would use che or cui, formal writing reaches for the inflected form:
L'imputato, il quale aveva confessato il reato, è stato condannato.
The defendant, who had confessed the crime, was convicted.
L'autrice, la quale ha vinto il premio Strega, terrà una conferenza.
The author, who won the Strega prize, will give a lecture.
I cittadini, i quali hanno il diritto di voto, devono recarsi alle urne.
The citizens, who have the right to vote, must go to the polls.
In speech, all three of these would normally use che. In writing, il quale sounds more measured.
Use 2: Avoiding ambiguity
This is the most important use of il quale for a learner — and the one that justifies its existence even in informal Italian. When che would refer back ambiguously to either of two preceding nouns, the inflected il quale can disambiguate by agreeing in gender and number with one of them.
Ho parlato con Maria e suo marito, il quale è medico.
I spoke with Maria and her husband, who is a doctor.
If we wrote Ho parlato con Maria e suo marito, che è medico, the relative could in principle attach to either Maria or suo marito — though context strongly favors the husband. Il quale is unambiguous: it's masculine, so it must refer to suo marito.
Ho parlato con Maria e suo marito, la quale è medico.
I spoke with Maria and her husband, who (Maria) is a doctor.
Same sentence, but la quale forces the reading back to Maria. This kind of precision is impossible with che alone.
Ho visto la macchina del professore, la quale era nuova.
I saw the professor's car, which (the car) was new.
Compare to il quale era nuovo, which would refer to il professore. The agreement does the disambiguating work.
Conosco il fratello di Anna, la quale vive a Milano.
I know Anna's brother — and Anna lives in Milan.
Conosco il fratello di Anna, il quale vive a Milano.
I know Anna's brother, who lives in Milan.
Two different meanings, distinguished only by the gender of quale. Che could not make the distinction.
Use 3: After a preposition (formal alternative to cui)
Combined with prepositions, il quale contracts with the article: del quale, al quale, dal quale, nel quale, sul quale. These are the formal counterparts of di cui, a cui, da cui, in cui, su cui:
Il libro del quale ti ho parlato è uscito ieri.
The book I told you about came out yesterday.
La persona alla quale ho scritto non ha risposto.
The person I wrote to hasn't answered.
L'epoca nella quale viveva Dante è il Trecento.
The era in which Dante lived is the fourteenth century.
Il motivo per il quale sono qui è semplice.
The reason for which I'm here is simple.
L'amico con il quale studio si chiama Marco.
The friend I study with is called Marco.
In the spoken language, every one of those would normally use cui. In careful writing — particularly bureaucratic, legal, or academic — del/al/nel + quale is more common.
A side-by-side comparison
To put the three relative pronouns next to each other:
| Function | Informal (che / cui) | Formal (il quale) |
|---|---|---|
| Subject | che | il quale / la quale |
| Direct object | che | il quale (rare; sounds heavy) |
| Object of di | di cui | del quale / della quale |
| Object of a | a cui | al quale / alla quale |
| Object of in | in cui | nel quale / nella quale |
| Object of su | su cui | sul quale / sulla quale |
| Object of da | da cui | dal quale / dalla quale |
| Object of con | con cui | con il quale / con la quale |
| Object of per | per cui | per il quale / per la quale |
In ordinary writing and almost all speech, the left column wins. The right column belongs to formal contexts and to disambiguation.
When il quale is genuinely required (and when it just sounds heavy)
The most important thing to internalize: il quale is rarely required. In most situations where it appears, che or cui would be perfectly grammatical and far more natural. Forcing il quale into spoken Italian sounds stilted, even pedantic.
The one place il quale is genuinely necessary is when che would be ambiguous and you need to clarify the antecedent's gender and number. Outside of that, treat it as a stylistic choice for register.
A reasonable heuristic for learners:
- In speech, use che and cui unless ambiguity forces you to clarify. Then switch to the matching il/la quale.
- In everyday writing (emails, blog posts, casual essays), the same — che and cui dominate.
- In formal writing (academic papers, legal documents, journalism, literary prose), il quale is appropriate and even expected.
- For non-restrictive clauses with two possible antecedents, prefer il quale even in speech.
Il quale in non-restrictive clauses
Il quale especially favors non-restrictive (parenthetical) clauses — the ones with commas. In restrictive clauses, where the relative is essential to identifying the antecedent, che is overwhelmingly preferred:
Mio padre, il quale ha settant'anni, è ancora molto attivo.
My father, who is seventy, is still very active.
Roma, la quale è la capitale d'Italia, ha più di due milioni di abitanti.
Rome, which is Italy's capital, has more than two million inhabitants.
Il presidente, il quale è stato eletto l'anno scorso, ha tenuto un discorso.
The president, who was elected last year, gave a speech.
In restrictive clauses, il quale as subject is almost never used:
Il libro che ho letto è bello.
The book I read is nice. (Standard, restrictive)
You would not normally say il libro il quale ho letto. That construction is grammatically possible but sounds strange — restrictive clauses want the lighter pronoun.
Subject vs object: il quale's strong vs weak positions
Il quale as a subject of the relative clause is more common and more natural than as a direct object. Compare:
Il direttore, il quale ha firmato il contratto, è in riunione.
The director, who signed the contract, is in a meeting. (subject — natural)
Il direttore, il quale ho incontrato ieri, è in riunione.
The director, whom I met yesterday, is in a meeting. (object — sounds heavy)
The second sentence is grammatical but stilted. Native speakers would prefer Il direttore, che ho incontrato ieri, in non-restrictive contexts. As a direct object, che is the default; il quale for direct objects is reserved for the most formal registers.
Some real-world formal examples
The following examples are typical of the registers where il quale thrives — legal, academic, journalistic — and give a sense of how it feels in context:
Le parti, le quali si impegnano a rispettare il contratto, firmano in calce.
The parties, who undertake to respect the contract, sign at the bottom.
L'articolo a cui (or al quale) si fa riferimento è il numero 27 della Costituzione.
The article being referred to is number 27 of the Constitution.
L'autore, il quale ha vinto il Nobel nel 1997, è morto nel 2016.
The author, who won the Nobel in 1997, died in 2016.
La sentenza, la quale è stata pubblicata oggi, ha provocato molte reazioni.
The verdict, which was published today, provoked many reactions.
In each of these you could substitute che or cui — and in spoken contexts you should — but the il quale versions feel appropriate for the register.
Common Mistakes
1. Wrong agreement on quale
Because quale inflects, agreement errors are possible. The form must match the antecedent's gender and number:
❌ La donna, il quale è una scrittrice famosa.
Incorrect — antecedent 'donna' is feminine, so 'la quale'
✅ La donna, la quale è una scrittrice famosa.
The woman, who is a famous writer.
❌ Gli amici, le quali abitano a Roma.
Incorrect — 'amici' is masculine plural, so 'i quali'
✅ Gli amici, i quali abitano a Roma.
The friends, who live in Rome.
2. Using il quale where che suffices
Sticking il quale into ordinary spoken or casual written Italian sounds wrong, not formal. In particular, restrictive clauses with il quale as subject sound awkward:
❌ Il libro il quale ho letto è bello.
Sounds stilted; 'il quale' rare in restrictive clauses
✅ Il libro che ho letto è bello.
The book I read is nice.
❌ La canzone la quale mi piace è in spagnolo.
Awkward in everyday speech
✅ La canzone che mi piace è in spagnolo.
The song I like is in Spanish.
The lesson: il quale has its place, but it's not a universal upgrade from che. Using it everywhere makes you sound like you're imitating bureaucratic Italian.
3. Forgetting the article in the prepositional contraction
After a preposition, the article + quale must contract correctly with the preposition:
❌ Il libro di il quale ti parlo.
Incorrect — 'di + il' must contract to 'del'
✅ Il libro del quale ti parlo.
The book I'm telling you about.
❌ La persona a la quale ho scritto.
Incorrect — 'a + la' must contract to 'alla'
✅ La persona alla quale ho scritto.
The person I wrote to.
The preposition + article contractions (del, della, dei, delle, al, alla, ai, alle, dal, dalla, nel, nella, sul, sulla) follow the same rules as elsewhere in Italian.
4. Using il quale in restrictive clauses to sound formal
Some learners assume formal Italian always prefers il quale. It doesn't — formal Italian still uses che for restrictive clauses:
❌ Lo studente il quale ha vinto il concorso è italiano.
Sounds awkward, even in formal writing
✅ Lo studente che ha vinto il concorso è italiano.
The student who won the competition is Italian.
If you want to elevate the register, use richer vocabulary, longer sentences, more careful word choice — not il quale in places that don't call for it.
5. Failing to disambiguate when ambiguity matters
The reverse error: che where il quale would have prevented confusion. This is more of a stylistic problem than a strict grammar error, but in writing it can genuinely mislead the reader:
(ambiguous) Ho visto Maria e suo padre, che era stanco.
Could mean Maria or her father was tired.
(clear) Ho visto Maria e suo padre, il quale era stanco.
I saw Maria and her father, who was tired. (the father)
(clear) Ho visto Maria e suo padre, la quale era stanca.
I saw Maria and her father — and Maria was tired.
Don't be afraid to switch to il quale specifically to clarify reference. That's exactly what it's for.
Key Takeaways
- Il quale has four forms: il quale, la quale, i quali, le quali, agreeing with the antecedent.
- It belongs to formal and literary registers; in everyday speech, che and cui dominate.
- Its most useful function for learners is disambiguation — picking out one antecedent from two of different gender or number.
- After prepositions, it contracts: del quale, alla quale, nel quale, sul quale, etc.
- In restrictive clauses, il quale sounds heavy — stick with che.
- Don't use il quale as a "formal upgrade" by default; only when register or ambiguity calls for it.
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