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Is cousin marriage illegal in South Korea?

Yes. Cousin marriage is banned in South Korea. Banned out to 8th-degree relatives: even third cousins can't marry.

Civil Act art 809(1) bars marriage between blood relatives within the 8th degree (third cousins); Constitutional Court upheld it 5-4 on 27 Oct 2022 (2018Hun-Ba115); only the art 815(2) voidness rule was struck.

Source: Civil Act art. 809

• South Korea is one of 17 countries where cousin marriage is banned, and 8 more restrict it.
• Its neighbours: banned in 0 of 1.
• In Asia: banned in 6 of 46 countries.

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Other countries that ban cousin marriage

VietnamChinaPhilippinesUkraineBulgariaGreeceCroatiaSerbiaAustriaLithuaniaSwedenBosnia & HerzegovinaMontenegroNorth MacedoniaAll 17 on the map ›

What else is banned in South Korea