Is child marriage illegal in India?

Partly. Child marriage is restricted in India. Women 18, men 21 - but child marriages are only voidable.

Women 18, men 21; under-age marriages are voidable, not void; personal-law rulings differ.

Source: PCMA 2006

Banned (54)Restricted (41)Allowed

India is one of 54 countries where child marriage is banned, and 41 more restrict it.
Its neighbours: banned in 3 of 6 (Bhutan, China and Nepal).
In Asia: banned in 11 of 46 countries.

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Other countries that ban child marriage