Onzain (French pronunciation: [ɔ̃zɛ̃]) is a former commune in the French department of Loir-et-Cher, administrative region of Centre-Val de Loire.

On 1 January 2017, it was merged into the new commune Veuzain-sur-Loire.

[1] Onzain is twinned with Darley Dale, England and with Flein on the southern edge of Heilbronn, Baden-Württemberg, Germany.

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