The Genitive Case: Showing Who Something Belongs To

In English, possession is easy: add ‘s and you’re done — “Ali’s car.” Turkish spreads the job across two words instead of one, and once that clicks, a huge number of everyday phrases — names, relationships, capitals, family members — suddenly make sense.

What the genitive case does

The genitive case marks the possessor in a phrase — the “whose” — roughly matching English “‘s” or “of.” But Turkish doesn’t stop at marking the owner. The noun that’s owned also gets its own matching suffix. Both halves of the pair carry an ending:

[possessor + genitive suffix] + [thing owned + possessive suffix]

Ali’nin arabası — literally “Ali’s, his-car” — is how Turkish says “Ali’s car.” Drop either suffix and the phrase breaks.

Forming it

The genitive suffix has four shapes, chosen by vowel harmony from the last vowel of the possessor noun:

• last vowel a, ı → -ın
• last vowel e, i → -in
• last vowel o, u → -un
• last vowel ö, ü → -ün

If the noun ends in a vowel, a buffer -n- is inserted first:

• araba (car) → arabanın (of the car)
• kedi (cat) → kedinin (of the cat)

The matching possessive suffix on the owned noun (third person “his/her/its,” here) follows the same four-way harmony, with its own buffer -s- after a vowel: arabası, kedinin ad**ı.

Exceptions worth knowing

Personal pronouns don’t take the regular suffix at all — they have their own irregular genitive forms, and these double as the possessive words you’ll see before a noun:

• ben → benim (my / of me)
• sen → senin (your / of you)
• o → onun (his, her, its / of him-her-it)
• biz → bizim (our / of us)
• siz → sizin (your, plural / of you)
• onlar → onların (their / of them)

Proper nouns take an apostrophe before the suffix in writing: Ali’nin, Türkiye’nin, İstanbul’un.

And a handful of nouns quietly change their final consonant when any vowel-starting suffix lands on them — the same consonant-softening pattern that shows up across Turkish grammar: kitap (book) → kitabın (the book’s), not kitapın.

Examples

• Ali’nin arabası kırmızı. — Ali’s car is red.
• Bu, öğretmenin kalemi. — This is the teacher’s pen.
• Kedinin adı Pamuk. — The cat’s name is Pamuk.
• Türkiye’nin başkenti Ankara’dır. — Turkey’s capital is Ankara.
• Senin evin çok güzel. — Your house is very beautiful.
• Çocukların oyuncakları dağınık. — The children’s toys are scattered.

Every one of these is the same two-part pattern — owner takes -in/-ın/-un/-ün (or an irregular pronoun form), owned noun takes its matching suffix — whether the owner is a person, a place, or a whole group.

Try it yourself

Babi, Speafy’s AI tutor, will walk you through real possessive phrases — from benim adım (“my name”) to Türkiye’nin başkenti (“Turkey’s capital”) — until the two-part pattern feels natural, and Speafy’s FSRS-based flashcards keep the irregular pronoun forms from fading.