French Possessive Adjectives: Mon, Ma, Mes and More

French possessive adjectives look simple: one word for my, one for your, one for his. Then a student says son mère about a man's mother, and we discover that French and English do not ask the same question. English asks "who owns it?" French asks "what is the thing owned?"

Once you switch to the French question, possessives become one of the easiest points of French grammar. This page gives you the full table, the rule that trips up English speakers, the vowel exception, how to say "his" or "her" without ambiguity, and the cases where French drops the possessive completely.

French possessive adjectives: the full table

Possessive adjectives (French grammars also call them déterminants possessifs) go in front of a noun, like le or la. They replace the article, so you never say le mon livre.

A few examples:

• mon frère, ma sœur, mes parents: my brother, my sister, my parents
• ton chien, ta clé, tes chaussures: your dog, your key, your shoes
• notre maison, nos voisins: our house, our neighbors
• votre passeport, vos bagages: your passport, your luggage
• leur fils, leurs enfants: their son, their children

Notice the pattern: the first three rows have three forms, the last three rows only two. Notre, votre and leur do not change for gender, only for number.

Pronunciation hints: mon, ton, son end in a nasal sound, close to the "on" in "song" without the g. Mes, tes, ses rhyme with "may." Notre and votre sound like "NOH-truh" and "VOH-truh," with a short o.

Tip from class: the possessive is just an article with an owner attached. If you know whether a noun takes le or la, you know whether it takes mon or ma. That is why learning every noun with its article, as I explain in the guide to French noun gender, pays off here.

The rule: agree with the thing owned, not the owner

This is the heart of French possessive adjectives. The possessive agrees in gender and number with the noun that comes after it. The gender of the owner plays no role at all.

So sa voiture can mean his car, her car or its car. UT Austin's French grammar puts it in one word: context.

The memory trick I give my students: look right, not left. The owner sits on the left of the sentence; the possessive only looks at the noun on its right. If you catch yourself thinking "Paul is a man, so son," stop and look right instead.

This is the same logic as other French adjectives, which agree with the noun they describe. If agreement in general still feels shaky, the guide to French adjective agreement walks through it step by step.

Mon amie, not ma amie: the vowel rule

French dislikes two vowel sounds bumping into each other. So in front of a feminine singular noun that starts with a vowel or a silent h, ma, ta and sa switch to mon, ton and son:

• mon amie (my female friend), never ma amie
• ton école (your school)
• son histoire (his or her story)
• mon idée (my idea)

The noun does not become masculine. An adjective after it stays feminine: mon amie est française. And in speech you link the n to the noun: mon amie sounds like "mo-na-mee," son école like "so-nay-kol." If liaison is still new to you, the French pronunciation guide for beginners covers it.

Two details students miss:

• The switch depends on the next word, not on the noun itself. With an adjective in between, you go back to ma: mon amie but ma meilleure amie (my best friend).
• An aspirated h counts as a consonant, so ma stays: ma honte (my shame), sa hache (his or her axe).

His or her? How French clears up the ambiguity

Because son, sa and ses hide the owner's gender, a sentence like Marc et Léa sont venus avec son chien leaves you guessing. French has two everyday fixes.

1. Add à lui or à elle after the noun. C'est son chien à elle (it's her dog). This is very common in speech and also works for emphasis: c'est ma voiture à moi (it's MY car).

2. Use the owner's name. C'est le chien de Léa. Clear, and nobody will find it heavy.

A short dialogue from a lesson:

• Student: Léa est venue avec son frère.
• Magali: Son frère à elle, ou le frère de Marc?
• Student: À elle! Son frère à elle.
• Magali: Parfait. Et Marc est venu avec sa sœur?
• Student: Non… avec sa copine.

(Student: Léa came with her brother. Magali: Her own brother, or Marc's brother? Student: Hers! Her brother. Magali: Perfect. And Marc came with his sister? Student: No… with his girlfriend.)

Leur or leurs? The rule from the Académie française

Leur goes before a singular noun, leurs before a plural noun. The tricky part is deciding whether the thing owned is singular or plural when several people own something.

The Académie française gives a clear rule: leur stays singular when several people share one object, or when each person owns one object separately. It takes an s when each person owns several objects. Its examples:

• Ils acclament leur chef. They cheer their leader (one leader, shared).
• Ils ont pris leur chapeau et leur manteau. They took their hat and coat (one each).
• Ils ont ramassé leurs affaires. They gathered their things (several each).

English says "they took their coats," but French thinks "each one took his or her coat," so it stays singular. When in doubt, ask: does each person have one, or several?

Do not confuse this with the pronoun leur (to them), as in je leur parle. That one never takes an s. The difference is explained in the French pronouns guide.

Chacun, tout le monde and on: singular owners

English often says "everyone has their own opinion." French cannot copy that. Chacun (each one) and tout le monde (everyone) are grammatically singular, so they take son, sa or ses, never leur or leurs.

The Office québécois de la langue française (OQLF), the reference for French in Québec, lists this as a real error and gives examples like these:

• Tout le monde a dans son entourage une personne touchée par le cancer. Everyone has someone affected by cancer around them.
• Il revient à chacun d'assumer ses choix. It is up to each person to own their choices.

The same goes for collective nouns such as la population or la famille: la population donne son avis, not leur avis.

With on, the rule depends on meaning. When on means "one" or "people in general," use son, sa, ses: on doit respecter sa parole (one must keep one's word). In everyday speech, where on means "we," you will hear notre and nos: on a pris nos vélos (we took our bikes).

When French drops the possessive: body parts

English puts "my" in front of every body part. French usually does not, because it is obvious whose body you mean. It uses le, la, les instead:

• Elle a les yeux bleus. She has blue eyes.
• J'ai mal à la tête. I have a headache (literally, I have pain at the head).
• Je me lave les mains. I wash my hands.
• Il s'est cassé la jambe. He broke his leg.

In the last two, the reflexive pronoun (me, se) already shows whose hands or leg it is, which is why the possessive disappears. The guide to French reflexive verbs shows the full pattern.

You still use a possessive when the body part is the subject of the sentence: Mes mains sont froides (my hands are cold), Ton regard est triste (your look is sad). UT Austin's grammar notes one more twist: when an adjective comes before the body part, French switches to an indefinite article: il a un petit nez (he has a small nose).

Possessive adjectives vs possessive pronouns

A possessive adjective needs a noun after it: mon livre. A possessive pronoun replaces the noun completely: le mien (mine). They come with the definite article and agree with the thing owned too:

Ce n'est pas ta clé, c'est la mienne. It's not your key, it's mine. Note the circumflex: notre has a short o, but le nôtre has a long, closed o, like "oh."

Common mistakes English speakers make

• Mistake: son mère for "his mother" → Say instead: sa mère. The noun decides.
• Mistake: ma amie, ta école → Say instead: mon amie, ton école.
• Mistake: ma meilleure amie corrected to mon meilleure amie → Say instead: ma meilleure amie. The vowel rule only applies to the very next word.
• Mistake: Je me brosse mes dents → Say instead: Je me brosse les dents.
• Mistake: Tout le monde a leur opinion → Say instead: Tout le monde a son opinion.
• Mistake: le mon ami, un mon ami → Say instead: mon ami or un de mes amis (a friend of mine).

Practice

Fill in the possessive adjective.

1. Thomas parle à ___ grand-mère. (his)
2. Sophie a perdu ___ portefeuille. (her)
3. C'est ___ amie Claire. (my)
4. Les enfants ont fini ___ devoirs. (their, several each)
5. Chacun a ___ place. (his or her)

Answers: 1. sa (grand-mère is feminine). 2. son (portefeuille is masculine). 3. mon (feminine noun starting with a vowel). 4. leurs. 5. sa (chacun is singular, place is feminine).

In short

French possessive adjectives agree with the noun that is owned, so sa can mean his, her or its. Ma, ta and sa turn into mon, ton and son before a vowel sound, leur takes an s only when each owner has several things, and body parts usually take le, la, les. Next, pair this page with French relative pronouns, where dont expresses possession without any possessive at all.

If you'd like to stop hesitating between son and sa when you speak, book a free 30-minute assessment with Magali. We'll practice possessives in real conversation and you'll leave knowing exactly what to work on next.