Mühldorf is a Landkreis (district) in Upper Bavaria, Germany.

It is bounded by (from the north and clockwise) the districts of Landshut, Rottal-Inn, Altötting, Traunstein, Rosenheim, Ebersberg and Erding.

[2] In 1803, when the clerical states of Holy Empire were dissolved, Bavaria annexed these estates.

The district is located in generally plain countryside on either bank of the river Inn.

The coat of arms displays: Freed, John B. Noble Bondsmen: Ministerial Marriages in the Archdiocese of Salzburg, 1100-1343.