The Nonette is a tributary to the river Oise in northern France. It is 40.4 km (25.1 mi) long. Its source is in Nanteuil-le-Haudouin, from which it flows west through Senlis and Chantilly, and joins the Oise near Saint-Leu-d'Esserent.
The river has relatively high turbidity and its brownish water has a modest velocity due to the slight gradient of the watercourse; pH levels have been measured at 9.25 or quite alkaline near the Château d'Ermenonville and electrical conductivity of the waters have tested at 81 micro-siemens per centimetre.
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