After learning that mój, twój, nasz, and wasz all decline and agree, you might brace yourself for the third-person possessives "his," "her," and "their" to do the same. They do not. jego ("his / its"), jej ("her / its"), and ich ("their") are invariable: they never change form, no matter the gender, number, or case of the noun they sit in front of. This makes them, in one specific way, the easiest part of the Polish possessive system — there is nothing to compute. The danger is the opposite of the usual one: learners who have just drilled mój → mojego → moim over-apply that habit and wrongly try to inflect jego.
Why they don't change: frozen genitives
These words are not really possessive adjectives at all. They are the genitive case forms of the personal pronouns on ("he/it"), ona ("she/it"), and oni/one ("they"), pressed into service as possessives. jego is literally "of him," jej is "of her," ich is "of them." A genitive pronoun has no business agreeing with some other noun — it is already locked into its own case — so it simply sits there, unchanged, like the English "his." This is exactly how English does it too ("his car, his books, his idea" — "his" never moves), which is why this part feels familiar.
To jest jego samochód.
This is his car.
To jest jej samochód.
This is her car.
To jest ich samochód.
This is their car.
Invariable across gender
mój changes for the gender of the owned noun (mój dom, moja kawa, moje dziecko). jego does not budge — the same jego stands before a masculine, feminine, neuter, or plural noun:
| Owned noun | "my" (agrees) | "his" (frozen) |
|---|---|---|
| dom (m) | mój dom | jego dom |
| książka (f) | moja książka | jego książka |
| dziecko (n) | moje dziecko | jego dziecko |
| dzieci (pl) | moje dzieci | jego dzieci |
Jego żona i jego dzieci czekają na dworcu.
His wife and his children are waiting at the station. (jego before f and pl — unchanged)
Jej mąż gotuje, a jej syn sprząta.
Her husband is cooking, and her son is cleaning. (jej before m nouns — unchanged)
The contrast is the whole lesson: where mój has a dozen-plus forms, jego has exactly one. The choice between jego / jej / ich depends only on who the owner is (a he, a she, or a them) — never on the noun being owned.
Invariable across case
This is where the trap snaps shut for English speakers who have absorbed Polish case. mój changes in every case (z moim bratem, o mojej siostrze, mojemu ojcu). jego / jej / ich stay put even when the surrounding noun phrase is deep in some oblique case:
Rozmawiałem z jego bratem.
I talked with his brother. (instrumental phrase, but jego is unchanged)
Myślę o jej siostrze.
I'm thinking about her sister. (locative phrase, jej unchanged)
Dałem prezent jego synowi.
I gave a present to his son. (dative phrase, jego unchanged)
Mieszkam u ich rodziców.
I'm staying at their parents' place. (genitive phrase, ich unchanged)
In every one of those, the noun inflects (bratem, siostrze, synowi, rodziców) but the possessive does not. The case of the phrase is shown entirely by the noun and any true adjectives; jego/jej/ich contribute no case marking at all. So jego is, in this respect, less work than mój — there is no ending to get right.
Don't confuse possessive jego with object jego
There is one genuine subtlety. Because jego / jej / ich are recycled pronoun forms, the very same strings also appear as direct/indirect objects ("him, her, them"), not just as possessives. Context tells them apart: a possessive jego is followed by a noun it modifies; an object jego stands alone as the thing the verb acts on.
Znam jego brata.
I know his brother. (jego = possessive 'his', modifying brata)
Znam jego.
I know him. (jego = object 'him', the thing known)
Both are correct Polish; they simply play different roles. As a possessive, jego never inflects. As an object pronoun, it is one of several case forms of on (covered on the stressed and clitic pronoun page).
The swój warning
There is one situation where jego / jej / ich is grammatically possible but means something you may not intend. When the owner is the subject of the same clause, Polish requires the reflexive possessive swój, not jego/jej/ich. Using jego there forces a reading of "someone else's":
Jan kocha swoją żonę.
Jan loves his (own) wife. (subject owns it → swój)
Jan kocha jego żonę.
Jan loves his (= another man's) wife. (jego → a different man's wife!)
This is one of the most consequential distinctions in Polish, and it gets its own page. Before you reach confidently for jego/jej/ich, check the swój page: if the owner is also the subject, you almost always want swój.
Common Mistakes
❌ Rozmawiam z jegom bratem.
Incorrect — jego never takes an instrumental ending; it stays jego.
✅ Rozmawiam z jego bratem.
I'm talking with his brother.
The signature over-correction: bolting a mój-style case ending onto jego. There is no such ending. The noun inflects; jego does not.
❌ To jest jejej dom.
Incorrect — 'her' is simply jej; there is no agreeing form.
✅ To jest jej dom.
This is her house.
jej covers "her" before any noun in any gender and case. Do not try to make it agree like moja/mojej.
❌ Lubię ichich nauczyciela.
Incorrect — 'their' is ich, invariable, even before an accusative noun.
✅ Lubię ich nauczyciela.
I like their teacher.
ich ("their") never changes for the case of what follows. The noun nauczyciela shows the accusative; ich contributes nothing and stays ich.
❌ Jan wziął jego płaszcz.
Misleading — if it's Jan's own coat, this says he took another man's coat. Use swój.
✅ Jan wziął swój płaszcz.
Jan took his (own) coat.
When the owner is the subject, jego signals someone else's. For "his own," Polish demands swój.
Key Takeaways
- jego (his), jej (her), ich (their) are invariable — one form each, regardless of the owned noun's gender, number, or case.
- They are frozen genitive pronoun forms ("of him / of her / of them"), which is why they cannot agree.
- This makes them easier than mój: nothing to inflect. The error to avoid is over-applying mój-style endings.
- The choice among the three depends only on the owner (he / she / they), never on the thing owned.
- If the owner is the subject of the clause, use swój instead — jego/jej/ich there means "someone else's."
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Start learning Polish→Related Topics
- Possessive Pronouns: mój, twój, nasz, waszA1 — Polish 'my', 'your', and 'our' agree with the thing owned, not the owner — and they fully decline for case, so 'my' has more than a dozen forms.
- swój: The Reflexive PossessiveB1 — When the owner is the subject of the clause, Polish forces the reflexive possessive swój — and using jego or jej instead quietly changes the meaning to 'someone else's'.
- Declining Personal Pronouns: Stressed vs Clitic FormsA2 — The full case declension of the Polish personal pronouns, and the crucial split between long stressed forms (mnie, ciebie, jego, tobie) and short unstressed clitics (mi, cię, go, mu) — plus the n-forms (niego, niej, nim) that prepositions force.
- Third-Person Pronouns and Gender AgreementA2 — How on/ona/ono track grammatical gender — Polish has no all-purpose 'it', so a table (stół) is on and a book (książka) is ona — and how oni vs one split 'they', with the genitive/accusative forms (go/jego/niego, ją/jej/nią, je/nie).
- Grammatical Gender: Three GendersA1 — Every Polish noun is masculine, feminine, or neuter — and its gender, usually readable from the nominative ending, drives all agreement.