Nizhneudinsky

Nizhneudinsky (masculine), Nizhneudinskaya (feminine), or Nizhneudinskoye (neuter) may refer to:
 * Nizhneudinsky District, a district of Irkutsk Oblast, Russia
 * Nizhneudinskoye Urban Settlement, a municipal formation which the town of Nizhneudinsk in Nizhneudinsky District of Irkutsk Oblast, Russia is incorporated as