Oarța de Jos (Hungarian: Alsóvárca) is a commune in Maramureș County, Crișana, Romania. It is composed of three villages: Oarța de Jos, Oarța de Sus (Felsővárca), and Orțița (Középvárca).
The commune is located in the southwestern part of the county, at a distance of 54 km (34 mi) from the county seat, Baia Mare, and 20 km (12 mi) from Cehu Silvaniei. The river Oarța flows through the commune's three villages.