Dualchi (Sardinian: Duarche) is a comune (municipality) in the Province of Nuoro in the Italian region Sardinia, located about 110 kilometres (68 mi) north of Cagliari and about 40 kilometres (25 mi) west of Nuoro.

Dualchi borders the following municipalities: Aidomaggiore, Birori, Borore, Bortigali, Noragugume, Sedilo, Silanus.

Already inhabited area during the Nuragic period, as suggested by the presence in the territory of some Nuraghes, Dualchi belonged to the Judicate of Torress in the Middle Ages and was part of the curatoria of Marghine.

Upon the fall of the Arborean Judicate (1429), Dualchi became part of the Aragonese marquisate of Oristano.

From the Pimentel it passed to the Tellez-Giron, to which it was ransomed in 1839 with the abolition of the feudal system.