The Ourcq (French: [uʁk] ⓘ, Urc in 855) is an 86.5-kilometre-long (53.7 mi) river in France, a right tributary of the Marne.

[1] Its source is near the village Ronchères, and its course crosses the departments of Aisne, Oise, and Seine-et-Marne.

Napoleon I made use of the river as a water source, and it supplied the city of Paris until Baron Haussmann's rebuilding of Paris.

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