The article is devoted to the new historical investigations concerning Latvian reflections on Lithuanian-Polish conflict concerning Vilnius annex (1920-1921). The Polish occupation of the ancient Lithuanian capital of Vilnius and its annexation by Poland caused an irreparable damage in the relations between that country and her northern neighbours. The process of the Lithuanian-Polish conflict depended not only on these two feuding sides. Latvia’s position was important too. Latvia tried to trim between these two countries. In 1921 Latvia socially began to support Lithuanian’s policy regarding Vilnius, but in the same breath it officially declared neutrality.