Nienburg

Nienburg, meaning "new castle", may refer to the following locations in Germany:


 * Nienburg (district), Lower Saxony
 * Nienburg, Lower Saxony
 * Nienburg station
 * Nienburg II – Schaumburg, a German parliament constituency
 * Nienburg, Saxony-Anhalt
 * Nienburg Abbey, a Benedictine monastery
 * Nienburg (Verwaltungsgemeinschaft), a collective municipality, disbanded in 2010