The Naab ( Czech: Nába) is a river in Bavaria, Germany, and is a left tributary of the Danube. It is approx. long, including its main source river Waldnaab.
The Naab is formed by the confluence of the Waldnaab and the Haidenaab in Luhe-Wildenau, south of Weiden in der Oberpfalz. It flows generally south, through the towns Nabburg, Schwandorf and Burglengenfeld. It flows into the Danube near Regensburg.