Traunstein is a Landkreis (district) in the southeastern part of Bavaria, Germany.

Neighboring districts are (from the north clockwise) Mühldorf, Altötting, the Austrian states Upper Austria and Salzburg, the district Berchtesgadener Land, the Austrian states of Salzburg and Tyrol, and the district Rosenheim.

The coat of arms shows a blue panther to the left, the symbol of the Spanheim dynasty of the Counts of Krainburg-Ortenburg, who owned part of the area in medieval times.

The eagle in the top-right derives from the diocese of Chiemsee.

Towns Markt ¹ administered inside aVerwaltungsgemeinschaft Verwaltungsgemeinschaften Municipalities