Coutarnoux (French pronunciation: [kutaʁnu]) is a commune in the Yonne department in Bourgogne-Franche-Comté in north-central France.

The oldest known form of its name is Curtis Arnulfi, "the enclosure belonging to a (Frankish or other German) man named Arnwulf" who invaded Gaul in the 4th to 6th centuries.

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