The arrondissement of Thionville-Ouest is a former arrondissement of France in the Moselle department in the Lorraine region. In 2015 it was merged into the new arrondissement of Thionville. It had six cantons and 30 communes.CompositionCantonsThe cantons of the arrondissement of Thionville-Ouest were: Algrange Fameck Florange Fontoy Hayange Moyeuvre-GrandeCommunesThe communes of the arrondissement of Thionville-Ouest, and their INSEE codes, were: