83.6% of the Lithuanian population are ethnic Lithuanians who speak the Lithuanian language (one of the two surviving members of the Baltic language group), which is the official language of the state. Several sizable minorities exist, such as Poles (6.7%), Russians (6.3%), Belarusians (1.2%) and others – 2.3%. Lithuania is home to as many as 115 ethnic groups. Based on ethnic composition, Lithuania is the most indigenous of all the Baltic countries.

Poles are the largest minority, concentrated in southeast Lithuania (the Vilnius region). Russians are the second largest minority, concentrated mostly in two cities; they constitute sizeable minorities in Vilnius (14%) and Klaipėda (28%) and a majority in the town of Visaginas (65%). About 3,000 Roma live in Lithuania, mostly in Vilnius, Kaunas, and Panevėžys; their organizations are supported by the National Minority and Emigration Department.

Because of Soviet occupation, most Lithuanians can communicate in Russian. According to the Euro state poll around 80% of the Lithuanians can hold a conversation in Russian and almost all are familiar with the most general phrases and expressions. Nowadays, most Lithuanian schools teach English as a first foreign language, but students may also study German, or, in some schools, French. Schools where Russian and Polish are the primary languages of education exist in the areas populated by these minorities.