La Madelaine-sous-Montreuil (French pronunciation: [la madlɛn su mɔ̃tʁœj], literally La Madelaine under Montreuil; Picard: El Madelaine-dsou-Montreu) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France.

[3] La Madelaine-sous-Montreuil is situated adjacent to the northwest of Montreuil-sur-Mer on the D139 road and by the banks of the Canche river.

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