Vilyuysk (Russian: Вилюйск; IPA: [vʲɪˈlʲʉjsk]; Yakut: Бүлүү, Bülüü) is a town and the administrative center of Vilyuysky District in the Sakha Republic, Russia, located on the Vilyuy River (left tributary of the Lena), about 600 kilometers (370 mi) from Yakutsk, the capital of the republic. As of the 2010 Census, its population was 10,234.
The first permanent settlement on the site of the present town was a Cossack winter settlement founded in 1634 as Tyukanskoye or Verkhnevilyuyskoye.
Members of the peasant rebellion led by Yemelyan Pugachev were exiled to the area in the 1770s, building the new town of Olensk in 1783. The town's name was derived from the Russian word "олень" (olen), meaning "stag", as still seen in the town's symbols. The town was renamed Vilyuysk after the river on which it stands in 1821.
Within the framework of administrative divisions, Vilyuysk serves as the administrative center of Vilyuysky District. As an inhabited locality, Vilyuysk is classified as a town under district jurisdiction. As an administrative division, it is, together with one rural locality (the selo of Sosnovka), incorporated within Vilyuysky District as the Town of Vilyuysk. As a municipal division, the Town of Vilyuysk is incorporated within Vilyuysky Municipal District as Vilyuysk Urban Settlement.
Vilyuysk is a town in the Sakha Republic, Russia.
Vilyuysk may also refer to: