Montbrun (; Montbrun in Occitan) is a former commune in the Lozère departement in southern France. On 1 January 2017, it was merged into the new commune Gorges du Tarn Causses.Arrêté préfectoral 4 July 2016 Its population was 80 in 2022.

See also Communes of the Lozère department Causse Méjean

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