Valday or Valdai may refer to: Valdai Hills, an upland region in Russia Valdai Discussion Club Valday (inhabited locality), several inhabited localities in Russia Lake Valdayskoye (or Lake Valdai), a lake in Novgorod Oblast, Russia Valday (ship), a class of Russian freight ships Dolgiye Borody (residence), a home of the president of Russia, also commonly known as "Valdai"