The Freiberger Mulde (also called the Östliche Mulde or Eastern Mulde; ) is the right-hand, headstream of the river Mulde, whose catchment covers an area of in the Czech Republic and Germany in central Saxony. It has a volumetric flow of which is greater than that of the other headstream, the Zwickauer Mulde (or Westliche Mulde or Western Mulde) who flow is about , which is nevertheless the longer stream.
The source of the river is in the Ore Mountains, near Moldava, in the Czech Republic. It runs northwest, crossing the border with Germany after a few km, to Freiberg (hence the name), and further northwest through Nossen, Döbeln and Leisnig. A few km north of Colditz, the Freiberger Mulde is joined by the Zwickauer Mulde to form the Mulde. The Mulde is a tributary of the Elbe.