Upper Saxon (German: Obersächsisch) is an East Central German dialect spoken in much of the modern German State of Saxony and in the adjacent parts of Saxony-Anhalt and Thuringia. Though colloquially called "Saxon" (Sächsisch), it is not to be confused with the Low Saxon dialect group in Northern Germany. Upper Saxon is closely linked to the Thuringian dialect spoken in the adjacent areas to the west.
The Upper Saxon dialect evolved as a new variety in the course of the medieval German Ostsiedlung (eastern settlement) from about 1100 onwards. Settlers descending from the stem duchy of Saxony speaking Old Saxon, but also from Thuringia, moved into the Margraviate of Meissen beyond the Elbe and Saale rivers then populated by Polabian Slavs. The importance of the Upper Saxon chancery German rose with establishment of the Saxon electorate. In the context of the Bible translation by Martin Luther, it played a large part in the development of the Early New High German language as a standard variety.