Luc-sur-Orbieu (French pronunciation: [lyk syʁ ɔʁbjø] ⓘ, literally Luc on Orbieu; Occitan: Luc d'Orbiu) is a commune in the Aude department in southern France.

The village lies on the right bank of the Orbieu, which forms most of the commune's western border, then flows east through the northern part of the commune.

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