Ognon may refer to:

3 different rivers of France:

• Ognon (Franche-Comté) in Franche-Comté, tributary of the Saône
• Ognon (Loire-Atlantique) in Loire-Atlantique
• Ognon, which becomes the Ornain after its confluence with the Maldite

A commune in France, see Ognon, Oise

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