Betzdorf Castle (Luxembourgish: Betzder Schlass, French: Château de Betzdorf, German: Betzdorf Schloss/Schloss Betzdorf) is a former castle in the commune of Betzdorf, in eastern Luxembourg. It is the headquarters of SES S.A., the world's largest satellite operator in terms of revenue and the largest component of Luxembourg Stock Exchange's main LuxX Index. It is located north-west of Betzdorf village, to the north of the CFL Line 30 railway line.