Hi!
How can I say roommate in turkish?

Tks you

Did you try using the dictionary that is available here?
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English -> Turkish
roommate
i. oda arkadaşı.

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English -> English
roommate
One of twe or more occupying the same room or rooms; one who shares the occupancy of a room or rooms; a chum.

I have never used oda arkadaşı used. This implies you are sharing the same room.

The more usual term is ev arkadaşı for someone who is sharing the same apartment or house with you.