The Canton of Romilly-sur-Seine-1 is a former canton of the arrondissement of Nogent-sur-Seine, in the Aube department, in northern France. It was disbanded following the French canton reorganisation which came into effect in March 2015. It consisted of 12 communes:

• Crancey
• La Fosse-Corduan
• Gélannes
• Maizières-la-Grande-Paroisse
• Origny-le-Sec
• Orvilliers-Saint-Julien
• Ossey-les-Trois-Maisons
• Pars-lès-Romilly
• Romilly-sur-Seine (partly)
• Saint-Hilaire-sous-Romilly
• Saint-Loup-de-Buffigny
• Saint-Martin-de-Bossenay

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