Possessive Pronouns (Мій, Твій, Наш, Свій) | Ukrainian Grammar

A possessive pronoun answers "whose?" — "my, your, our, their." In English they are fixed little words ("my book," "my books," "in my book" — "my" never changes). Ukrainian possessives behave like adjectives: they agree with the noun they attach to in gender, number, and case, so the single idea "my" surfaces as мій, моя́, моє́, мої́, мого́, мої́й, and more. This page teaches the four that fully decline (мій, твій, наш, ваш), the third-person forms that surprisingly don't (його́, її́), and introduces the reflexive свій "one's own" — the possessive English simply doesn't have.

The crucial principle: agree with the thing owned, not the owner

This is the first thing to internalize, because English does the opposite. In English "my" tells you about the owner (me) and ignores the thing. In Ukrainian, мій tells you about the thing owned: masculine стіл takes мій, feminine кни́га takes моя́, neuter вікно́ takes моє́, plural дру́зі take мої́. The owner is the same "me" throughout — only the noun changes the ending.

Thing owned	"my"	"your (sg.)"	"our"	"your (pl.)"
masc. (стіл)	мій	твій	наш	ваш
fem. (кни́га)	моя́	твоя́	на́ша	ва́ша
neut. (вікно́)	моє́	твоє́	на́ше	ва́ше
plural (дру́зі)	мої́	твої́	на́ші	ва́ші

Це мій брат, а то моя́ сестра́ — вони́ близню́ки.

This is my brother, and that's my sister — they're twins. — same owner 'my,' but мій (masc. брат) vs моя́ (fem. сестра́).

Твоє́ па́льто на ві́шаку, а твої́ чо́боти біля две́рей.

Your coat is on the hook, and your boots are by the door. — neuter твоє́ with па́льто, plural твої́ with чо́боти.

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Forget "whose is it?" as the thing that shapes the word. The possessive copies the noun beside it: a feminine noun forces моя́/твоя́/на́ша, a neuter forces моє́/твоє́/на́ше — exactly as a normal adjective would. The owner stays the same; the ending tracks the thing.

Мій runs through all seven cases

Because they are adjective-like, мій and friends also change with case. When the noun goes into the genitive, dative, locative, and so on, the possessive follows. Here is the full declension of мій "my" — твій and свій follow the identical pattern, so this one table covers three pronouns; наш and ваш follow the regular hard-adjective pattern (на́шого, на́шому, на́шій…).

Case	masc.	neut.	fem.	plural
Nominative	мій	моє́	моя́	мої́
Genitive	мого́	мого́	моє́ї	мої́х
Dative	моє́му	моє́му	мої́й	мої́м
Accusative	мій / мого́*	моє́	мою́	мої́ / мої́х*
Instrumental	мої́м	мої́м	моє́ю	мої́ми
Locative	(на) моє́му / мої́м	моє́му / мої́м	(на) мої́й	(на) мої́х

The accusative follows *animacy: with an inanimate masculine noun it copies the nominative (мій стіл), with an animate one it copies the genitive (мого́ бра́та) — exactly like adjectives.

У мої́й кни́зі бракує оста́нньої сторі́нки.

My book is missing its last page. — feminine locative мої́й agreeing with кни́зі.

Я зателефону́вала своє́му бра́тові й попроси́ла про допомо́гу.

I called my brother and asked for help. — here свій in the dative своє́му, declining just like мій.

Ми пиша́ємося на́шими дітьми́.

We are proud of our children. — instrumental plural на́шими, with наш following the hard-adjective pattern.

The third person is the exception: його́ and її́ DON'T change

Now the trap. For "his / its" and "her," Ukrainian uses the genitive of the personal pronoun — його́ (from він/воно́) and її́ (from вона́) — and these are invariable. They do not agree with the thing owned and do not decline at all. його́ кни́га, його́ кни́ги, у його́ кни́зі, з його́ бра́том — його́ never moves.

Його́ маши́на, його́ кварти́ра, його́ пробле́ми — усе́ на ньо́му.

His car, his apartment, his problems — it all rests on him. — his stays його́ across feminine, feminine, and plural without a flicker of change.

Я була́ в її́ кварти́рі лише́ раз.

I was in her apartment only once. — її́ stays її́ even though кварти́рі is in the locative; it doesn't agree.

This is genuinely odd from inside the system: a learner who has just drilled "everything agrees" reaches for an agreeing form of "his" and there isn't one. Accept it as a fixed quirk — його́ and її́ are frozen.

"Their": invariable їх vs declining їхній

For "their" Ukrainian gives you two options, and they behave differently:

їх — the frozen genitive of вони́, used as a possessive ("their"), invariable like його́/її́: їх дім, у їх до́мі.
їхній — a proper possessive adjective that agrees and declines in full: їхній дім, їхня кварти́ра, їхнє вікно́, їхні дру́зі, у їхньому до́мі.

Modern standard Ukrainian prefers їхній (the declining one) precisely because it agrees and reads more naturally; їх as a possessive is acceptable but feels barer and is sometimes flagged as a Russianism in careful style. So for "their," favour їхній.

Їхній буди́нок стої́ть на краю́ села́, а їхня соба́ка га́вкає на ко́жного.

Their house stands at the edge of the village, and their dog barks at everyone. — їхній (masc.) and їхня (fem.), agreeing like an adjective.

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Symmetry breaks in the 3rd person. мій, твій, наш, ваш, свій all decline and agree. його́, її́ are frozen and never agree. For "their," prefer the declining їхній over the frozen їх.

Свій — "one's own," pointing back to the subject

There is a sixth possessive with no English equivalent: the reflexive свій "one's own." You use it — instead of мій, твій, його́, etc. — when the owner is the subject of the clause. "I love my job" is Я люблю́ свою́ робо́ту, with свою́ rather than мою́, because the owner (I) is the one doing the loving.

Я люблю́ свою́ робо́ту, а ти лю́биш свою́?

I love my job — do you love yours? — свою́ for both, because each owner is the subject of their own clause.

Він узяв свою́ кни́гу й пішо́в.

He took his (own) book and left. — свою́ tells us the book is his own; його́ кни́гу would mean someone else's book.

свій declines exactly like мій (свій, своя́, своє́, свої́, свого́, свої́й…). And in the third person it does real semantic work that English can't: Він узяв свою́ кни́гу = "he took his own book," while Він узяв його́ кни́гу = "he took another man's book." English "he took his book" is ambiguous; Ukrainian forces the distinction. This is important and error-prone enough to get its own full page — see свій, the reflexive possessive.

Source-language comparison

For an English speaker, three rewires. (1) Possessives agree with the thing, not the owner — so "my" is мій or моя́ or моє́ depending on the noun. (2) They decline through cases — "in my book" is у мої́й кни́зі, not a fixed "my." (3) "His" and "her" (його́, її́) are the weird frozen ones that don't agree, the reverse of what your new "everything agrees" instinct predicts. And свій is a whole category English lacks.

For a Russian speaker, the system is parallel (мой/твой/наш/ваш/свой decline; его/её are frozen), so the structure transfers — but two Ukrainian specifics matter: prefer the declining їхній for "their" (Russian leans on the frozen их), and use the Ukrainian forms and stress (мого́, мої́й, своє́ї), not the Russian ones. Don't import Russian spellings of the declined forms.

Common Mistakes

❌ мій кни́га, моя́ стіл

Agreement error — the possessive agrees with the THING: feminine кни́га takes моя́, masculine стіл takes мій. So моя́ кни́га, мій стіл.

✅ моя́ кни́га, мій стіл

my book, my table — possessive agrees with the noun's gender.

❌ у мій кни́зі

Case error — when the noun goes locative (кни́зі), the possessive must too: у мої́й кни́зі. It can't stay nominative.

✅ у мої́й кни́зі

in my book — both words in the feminine locative.

❌ у його́му до́мі (declining його́)

Wrong — його́ is INVARIABLE; it never takes endings. 'In his house' is у його́ до́мі.

✅ у його́ до́мі

in his house — frozen його́.

❌ Я люблю́ мою́ робо́ту.

Reflexive error — when the owner is the SUBJECT (я), use свій: Я люблю́ свою́ робо́ту. мою́ here sounds foreign.

✅ Я люблю́ свою́ робо́ту.

I love my (own) job — reflexive свою́, owner = subject.

❌ Він узяв його́ кни́гу. (meaning his OWN book)

Ambiguity error — його́ кни́гу means ANOTHER man's book. For his own book you must use свою́: Він узяв свою́ кни́гу.

✅ Він узяв свою́ кни́гу.

He took his (own) book — свою́ for the subject's own possession.

Key Takeaways

Possessives agree with the thing owned, not the owner: мій стіл but моя́ кни́га, моє́ вікно́, мої́ дру́зі.
мій, твій, наш, ваш — and свій — fully decline through all seven cases (у мої́й кни́зі, своє́му бра́тові). мій/твій/свій share one paradigm.
його́ "his/its" and її́ "her" are frozen — they never agree and never decline (його́ кни́га, у його́ до́мі).
For "their," prefer the declining їхній (їхній дім, їхня кварти́ра) over the frozen їх.
свій "one's own" is used when the owner is the subject (Я люблю́ свою́ робо́ту) — and in the 3rd person it disambiguates his-own (свою́) from someone-else's (його́). See свій.

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