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Langres (French pronunciation: ​[lɑ̃ɡʁ]) is a commune in northeastern France. It is a subprefecture of the department of Haute-Marne, in the region of Grand Est.

Langres Cathedral (French: Cathédrale Saint-Mammès de Langres) is a Roman Catholic church in Langres, France. It was erected in the twelfth century, and is dedicated to the 3rd-century martyr Mammes of Caesarea. The cathedral is the seat of the Bishop of Langres, and is a national monument.

The Roman Catholic Diocese of Langres (Latin: Dioecesis Lingonensis; French: Diocèse de Langres) is a Roman Catholic diocese comprising the département of Haute-Marne in France.The diocese is now a suffragan in ecclesiastical province of the Archdiocese of Reims, having been a suffragan of Lyon until 2002.

The canton of Langres is an administrative division of the Haute-Marne department, northeastern France. Its borders were modified at the French canton reorganisation which came into effect in March 2015. Its seat is in Langres.It consists of the following communes: