In the history of Lithuania, the Vilnius Conference or Vilnius National Conference met on 18–22 September 1917, and began the process of establishing a Lithuanian state based on ethnic identity and language that would be independent of the Russian Empire, Poland, and the German Empire. It elected a twenty-member Council of Lithuania that was entrusted with the mission of declaring and re-establishing an independent Lithuania. The Conference, hoping to express the will of the Lithuanian people, gave legal authority to the council and its decisions. While the Conference laid the basic guiding principles of Lithuanian independence, it deferred any matters of the political structure of future Lithuania to the Constituent Assembly, which would later be elected in a democratic manner.

In the history of Lithuania, the Council of Lithuania, after July 11, 1918, the State Council of Lithuania was convened at the Vilnius Conference that took place between 18 and 23 September 1917. The twenty men who composed the council at first were of different ages, social status, professions, and political affiliations. The council was granted the executive authority of the Lithuanian people and was entrusted to establish an independent Lithuanian state. On 16 February 1918, the members of the council signed the Act of Independence of Lithuania and declared Lithuania an independent state based on democratic principles. 16 February is celebrated as Lithuania's State Restoration Day. The council managed to establish the proclamation of independence despite the presence of German troops in the country until the autumn of 1918. By the spring of 1919, the council had almost doubled in size. The council continued its efforts until the Constituent Assembly of Lithuania first met on 15 May 1920.