Valday

Valday or Valdai may refer to one of the following:
 * Valdai Hills, an upland region in Russia
 * Valdai Discussion Club
 * Valday (inhabited locality), name of several inhabited localities in Russia
 * Lake Valdayskoye (or Lake Valdai), a lake in Novgorod Oblast, Russia
 * Valday (ship), a class of Russian freight ships