Mariapfarr is a municipality in the district of Tamsweg, in the state of Salzburg, Austria. It lies in the Lungau region, the southeastern part of Salzburg state.
The town is known as the place where the young priest Joseph Mohr wrote the words to the Christmas carol "Silent Night." Mohr served in Mariapfarr, and the text he composed there became one of the world's most widely sung Christmas songs.