The Ource () is a long river in northeastern France, a right tributary of the river Seine. Its source is in the Haute-Marne department, 2km south of Poinson-lès-Grancey. It flows generally northwest. It joins the Seine at Bar-sur-Seine.

Its course crosses the following departments and communess:

• Haute-Marne: Poinson-lès-Grancey

• Côte-d'Or: Recey-sur-Ource, Brion-sur-Ource, Autricourt, Grancey-sur-Ource

• Aube: Essoyes, Celles-sur-Ource, Bar-sur-Seine

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