The House of Matsch, also written Maetsch, Mätsch, Metsch or Mazzo (Italian) is an old Swiss-Austrian noble family. Their origin is uncertain; they may have come from the Upper Valtellina from the village of Mazzo or may have been a sideline of the lords of Tarasp. The seats of the lords of Matsch were the castles of Obermatsch and Untermatsch in the Matscher Tal (Matsch Valley, Val di Mazia). Later they captured the at Schluderns in the Vinschgau (Venosta) valley and turned that into their main residence. For a time the lords of Matsch were one of the most powerful noble families in the Vinschgau and in present-day Graubünden.