Ususău (Hungarian: Marosaszó) is a commune in Arad County, Romania, situated in the couloir zone of the Mureş River, in the northern part of the Lipovei Hills. The administrative territory of the commune is 13,543 hectares. It is composed of five villages: Bruznic (Marosborosznok), Dorgoș (Dorgos), Pătârș (Petercse), Ususău (situated at 43 km from Arad) and Zăbalț (Szabálcs).