Haute-Marne (French pronunciation: [ot maʁn] ⓘ; English: Upper Marne) is a department in the Grand Est region of Northeastern France.

On 1 March, Prussia, Russia, the United Kingdom and Austria signed an accord forbidding any individual peace deal with Napoleon I, and to fight until his final defeat.

Haute-Marne is part of the region of Grand Est and is surrounded by the departments of Meuse, Vosges, Haute-Saône, Côte-d'Or, Aube, and Marne.

The fortified town of Langres, famous for Denis Diderot author of the Encyclopédie, the Renaissance castle of Joinville, the Lake Der-Chantecoq (one of the biggest artificial lake in Europe), the Chateau de Cirey where Voltaire lived for a while with Émilie du Châtelet and the village of Colombey-les-Deux-Églises where Charles De Gaulle lived until his death are all major attractions.

Haute-Marne is also well known for some famous French great men and women as: Charles de Gaulle was a longtime resident of the department, in Colombey-les-Deux-Églises, and died there on 9 November 1970, at the age of 79.