Linzgau is a historic region in Southern Germany, in the state of Baden-Württemberg. It is located north of Lake Constance and south of the Danube valley.
The region is bounded by the shore of Lake Constance on the south, the Hegau region on the west, the Rhine-Danube watershed on the north, and the Schussen valley on the east. It reaches west as far as Überlingen and north as far as Pfullendorf. The highest peak is Mt. Höchsten with a height of 837.8 m (2,749 ft).
While the lower parts on the lakeshore are part of the Bodenseekreis district, the upper lands belong to Sigmaringen district. Beside Pfullendorf and Überlingen, the region comprises the town of Markdorf, Meersburg, the municipality of Salem and several smaller communities.
The name derives from a Celtic name Lentia for what is now known as the Linzer Aach river.
The best-known remains of prehistoric human habitation in the region are the neolithic and bronze age pile dwellings on the shores of Lake Constance, of which some examples are reconstructed at Unteruhldingen. Similar neolithic structures have also been found in a peat bog near Ruhestetten in the municipality of Wald.
From the late Hallstatt culture on, the population can be regarded as Celts. Burial mounds have been discovered at Hödingen, Salem, and Stetten.