Castelculier (; Languedocien: Castelculhèr) is a commune in the Lot-et-Garonne department in south-western France.
The name of the village comes from the medieval fortress known as Chasteau Cullier. This castle was destroyed by the duke of ÃÂpernon in 1633 by order of Louis XIII, king of France.
The Séoune forms most of the commune's south-eastern border.
The town hall is located in the village of Grandfonds.
List of the lords of Castelculier