Lithuania's modern population stands at approximately 2.8 million people as of 2024, having declined from 3.7 million in 1990 through sustained emigration following European Union accession in 2004. Ethnic Lithuanians constitute roughly 84 percent of the population, with Poles forming the largest minority at around 6.5 percent, concentrated in the Vilnius region and Šalčininkai district near the southeastern border. Russians comprise approximately 5 percent, Belarusians around 1 percent, and smaller communities include Ukrainians, Jews, Tatars, Karaites, and Roma. The country experienced dramatic demographic shifts in the twentieth century—the 1923 census recorded 2.03 million residents in a territory smaller than present borders, Jewish communities that once comprised 7 to 8 percent of the pre-war population were almost entirely destroyed during German occupation from 1941 to 1944, and Soviet-era policies brought significant Russian-speaking immigration particularly to industrial centers like Visaginas. Current fertility rates hover near 1.4 children per woman, below replacement level, while life expectancy reached approximately 76 years in 2023, with persistent gaps between urban and rural areas.
The Lithuanian language belongs to the Baltic branch of Indo-European languages, making it among the most archaic living Indo-European tongues alongside Latvian. Lithuanian preserves features lost in most other Indo-European languages including seven noun cases, pitch accent systems, and vocabulary with direct cognates to Sanskrit. The language endured centuries without official status—prohibited in print from 1864 to 1904 under Russian imperial policies that mandated Cyrillic script, it survived through book smugglers called knygnešiai who transported Lithuanian-language texts printed in East Prussia across the border. Martynas Mažvydas published the first Lithuanian book, a catechism, in 1547 in Königsberg. Jonas Jablonskis standardized modern literary Lithuanian grammar in the early twentieth century, establishing rules that govern contemporary usage. Approximately 85 percent of Lithuania's residents speak Lithuanian as their first language, while Polish remains dominant in specific districts where it holds official regional status alongside Lithuanian. The Samogitian dialect spoken in Žemaitija differs substantially enough from standard Lithuanian that mutual intelligibility requires adjustment, featuring distinct phonology and vocabulary that some linguists classify as a separate language.
Christianity arrived in Lithuania later than elsewhere in Europe—Grand Duke Mindaugas accepted baptism in 1251 and received a crown from Pope Innocent IV in 1253, becoming the only crowned king in Lithuanian history, but he reverted to paganism around 1260 and was assassinated in 1263. The state remained officially pagan until 1387 when Grand Duke Jogaila converted to Catholicism as a condition of marrying Polish Queen Jadwiga, triggering gradual Christianization of the population over subsequent centuries. Baltic paganism persisted particularly in rural Žemaitija into the sixteenth century, maintaining worship of deities including thunder god Perkūnas, Žemyna the earth goddess, and Laima who governed fate and childbirth. Contemporary Lithuania identifies as approximately 77 percent Roman Catholic according to 2021 census data, though regular church attendance rates measure significantly lower at around 10 to 15 percent. Orthodox Christianity claims roughly 4 percent of believers, concentrated among Russian and Belarusian minorities. The Hill of Crosses near Šiauliai emerged as a pilgrimage site in the nineteenth century and became a symbol of resistance during Soviet occupation when authorities repeatedly bulldozed the crosses and believers continuously replaced them—Pope John Paul II visited the site in 1993. Romuva, a neopagan movement reviving pre-Christian Baltic religion, claimed approximately 5,100 adherents in the 2021 census.
The Grand Duchy of Lithuania emerged as a political entity in the thirteenth century when Baltic tribes unified against external threats from the Teutonic Knights and Livonian Order who conducted crusades along the Baltic coast. Mindaugas consolidated power over Lithuanian lands and neighboring Slavic territories, establishing a domain that his successors expanded dramatically. Gediminas, who ruled from approximately 1316 to 1341, moved the capital to Vilnius around 1323 and invited craftsmen, merchants, and religious orders to settle, issuing letters of invitation across Europe. His son Algirdas and nephew Kęstutis divided authority with Algirdas controlling eastern expansion into Slavic lands while Kęstutis defended western territories against the Teutonic Knights. Algirdas extended Lithuanian control to within 100 kilometers of Moscow and briefly held Kyiv. His son Jogaila became Grand Duke in 1377 amid internal conflicts with his cousin Vytautas. The 1385 Union of Krewo bound Lithuania to Poland through Jogaila's marriage to Jadwiga, creating a dynastic union that shaped both states for four centuries. Vytautas the Great governed Lithuania from 1392 to 1430 with unprecedented autonomy, defeating the Teutonic Knights decisively at the Battle of Grunwald in 1410 alongside Polish forces—a combined army estimated at 39,000 faced approximately 27,000 Teutonic and allied troops, resulting in a crushing defeat for the Order that ended its expansion. At maximum extent under Vytautas, Lithuanian-controlled territories stretched from the Baltic Sea to the Black Sea, encompassing present-day Belarus and substantial Ukrainian lands.
The 1569 Union of Lublin transformed the personal union between Poland and Lithuania into the Polish-Lithuanian Commonwealth, a single state with shared monarch and parliament but separate laws, armies, treasuries, and administrative structures. Lithuania ceded its Ukrainian territories to the Polish Crown under the union terms, significantly reducing its geographical extent. The Commonwealth period saw Lithuania's nobility adopt Polish language and culture extensively—by the eighteenth century, Polish had become the primary language of Lithuanian nobility and intelligentsia while Lithuanian persisted among peasantry. The Commonwealth's elective monarchy system produced political instability, and neighboring powers exploited internal weaknesses. Russia, Prussia, and Austria partitioned the Commonwealth three times between 1772 and 1795, erasing it from maps. The third partition placed most ethnic Lithuanian lands under Russian imperial control, with a smaller western portion including Klaipėda region falling to Prussia.
Two significant uprisings against Russian rule convulsed Lithuanian territories in 1830-31 and 1863-64, both coordinated with broader Polish rebellions. The 1863 uprising, led in Lithuania by Konstantinas Kalinauskas, resulted in harsh reprisals including executions, deportations to Siberia, and the 1864 press ban prohibiting Lithuanian publications in Latin script. Russian authorities mandated Cyrillic alphabet for Lithuanian texts and closed Catholic churches, converting some to Orthodox use. This period paradoxically strengthened Lithuanian national identity as book smugglers maintained illegal flow of Lithuanian publications from presses in Tilsit and other East Prussian cities. Jurgis Bielinis, one of the most prolific book smugglers, claimed in his memoirs to have transported over 40,000 books. The press ban ended in 1904 amid broader reforms following Russian defeats in the Russo-Japanese War.
Lithuanian national revival accelerated in the late nineteenth century through language preservation efforts, historical scholarship, and cultural organizations. Jonas Basanavičius, physician and cultural activist, founded the first Lithuanian-language newspaper Aušra in 1883. Vincas Kudirka, another physician, wrote the text of what became Lithuania's national anthem "Tautiška giesmė" in 1898. The Great Seimas of Vilnius convened in December 1905 with approximately 2,000 delegates demanding autonomy within the Russian Empire. World War I's eastern front devastated Lithuanian territories—German forces occupied the region from 1915, and the Lithuanian Council declared independence on February 16, 1918 in Vilnius, signed by twenty representatives including Jonas Basanavičius. The declaration initially proposed constitutional monarchy, but the 1919 Constituent Assembly established a democratic republic.