Onzain () 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.Arrêté préfectoral 26 September 2016 In 2022 its population was 3,113.
Onzain is twinned with Darley Dale, England and with Flein on the southern edge of Heilbronn, Baden-Württemberg, Germany.
See also Communes of the Loir-et-Cher department
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