The Waldviertel (Forest Quarter; Central Bavarian: Woidviadl) is the northwestern region of the northeast Austrian state of Lower Austria. It is bounded to the south by the Danube, to the southwest by Upper Austria, to the northwest and the north by the Czech Republic and to the east by the Manhartsberg (537 m, 1,762 ft), which is the survey point dividing Waldviertel from Weinviertel. Geologically it is a part of the Bohemian Massif. In the south are the Wachau and Kamptal wine regions.
The following administrative districts of Lower Austria are considered to be parts of the Waldviertel