Roeser (Luxembourgish: Réiser) is a commune and small town in southern Luxembourg. It is part of the canton of Esch-sur-Alzette, which is part of the district of Luxembourg.
As of 2005, the town of Roeser, which lies in the north of the commune, has a population of 682. Other towns within the commune include Berchem, Bivange, Crauthem, Kockelscheuer, Livange, and Peppange.