The canton of Saint-Dizier-1 is an administrative division of the Haute-Marne department, northeastern France. It was created at the French canton reorganisation which came into effect in March 2015. Its seat is in Saint-Dizier.

It consists of the following communes:

Allichamps Éclaron-Braucourt-Sainte-Livière Hallignicourt Humbécourt Laneuville-au-Pont Louvemont Moëslains Perthes Saint-Dizier (partly) Valcourt Villiers-en-Lieu

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