Montier-en-Der () is a former commune in the Haute-Marne department in north-eastern France. On 1 January 2016, it was merged into the new commune La Porte du Der.Arrêté préfectoral 29 December 2015 The 10th century church of the former Montier-en-Der Abbey has been preserved.

See also Communes of the Haute-Marne department

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