Montier-en-Der (French pronunciation: [mɔ̃tje ɑ̃ dɛʁ]) 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.

[2] The 10th century church of the former Montier-en-Der Abbey has been preserved.

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