Lithuanian is the sole official language and the dominant tongue across the entire country, spoken natively by approximately 85 percent of the 2.8 million population according to the 2021 census. It holds the distinction of being the most archaic living Indo-European language, retaining features lost in other branches over millennia, a fact linguists trace through preserved declension systems and phonetic structures present in Sanskrit and Ancient Greek. The language uses a Latin alphabet with nine additional diacritical letters: ą, č, ę, ė, į, š, ų, ū, ž. Lithuanian has two major dialect groups: Aukštaitian (highland, spoken in east and south) and Samogitian (Žemaičių, lowland, spoken in northwest), with Standard Lithuanian based on the western Aukštaitian subdialect established in the late 19th century. The language was banned in print under Russian imperial rule from 1864 to 1904, a period when Lithuanian books were smuggled from Prussia and taught in secret, making language preservation a core element of national identity that persists in contemporary attitudes toward linguistic purity.
English functions as the primary foreign language in Vilnius, Kaunas, and Klaipėda among residents under 40, with approximately 38 percent of Lithuanians reporting conversational English ability in the 2022 Eurobarometer survey. In Vilnius Old Town, Gedimino Avenue, and the business district around Europa Tower, English operates effectively in hotels rated three stars and above, restaurants displaying menus in English, museums including the National Museum and MO Museum, and retail establishments catering to international visitors. Banks such as Swedbank, SEB, and Luminor maintain English-language ATM interfaces and staff with English capability at central branches. The Vilnius Tourist Information Centre at Didžioji gatvė 31 provides services entirely in English. Kaunas sees functional English in Laisvės alėja (Liberty Avenue) commercial area, the Akropolis shopping center, and accommodations near Kaunas Castle, though less consistently than in the capital. Klaipėda port area, Old Town around Theatre Square, and hotels serving ferry passengers to/from Germany and Sweden offer English services. Outside these three cities, English becomes sparse. In Šiauliai, Panevėžys, and smaller towns such as Trakai, Druskininkai, and Nida, English may be found in tourist-focused businesses but not in general commerce, medical facilities, or municipal services.
Russian remains widely understood as a second language among Lithuanians over 45, a legacy of Soviet occupation from 1944 to 1990 when it was mandatory in schools. The 2021 census recorded Russian as a native language for 5.6 percent of the population, concentrated in Vilnius district (Vilniaus rajonas, not the city proper) where it reaches 22 percent, and in Visaginas, a planned Soviet-era city built for Ignalina Nuclear Power Plant workers where Russian speakers constitute 52 percent. In Vilnius city, Russian works in Fabijoniškės, Naujininkai, and Kirtimai neighborhoods, and among older shopkeepers in markets including Kalvarijų and Gariūnai. However, using Russian as a first approach carries political weight. Lithuania's citizenship law grants automatic citizenship only to those who were citizens before 1940 or their descendants, leaving some Soviet-era settlers stateless or holding Russian Federation passports, a point of ongoing tension particularly after Russia's 2022 invasion of Ukraine. Public signage in Russian is absent by law outside specific historical contexts. Staff in government offices, police stations, and public hospitals under 50 may refuse or claim not to understand Russian even when capable, a documented phenomenon in sociolinguistic studies by Vilnius University researchers in 2019.
Polish functions in specific geographic pockets near the Lithuanian-Polish border, particularly in Vilnius district municipalities of Šalčininkai (where the 2021 census recorded 77 percent Polish speakers) and Vilnius district (52 percent). These areas were part of Poland between the world wars and retain Polish-language schools, though this has generated legal conflict. In 2014, the European Court of Justice ruled on Lithuania's refusal to allow Polish diacritical marks (ą, ć, ę, ł, ń, ó, ś, ź, ż) on official documents, ultimately siding with Lithuania on standardization grounds. Street signs in Šalčininkai and Eišiškės appear in Lithuanian only, despite local majority Polish usage. In Vilnius city, Polish works in specific contexts: at the Church of St. Casimir on Didžioji gatvė where Mass is celebrated in Polish on Sundays, in businesses along Pylimo gatvė near the former Jewish quarter, and among older residents in Rasos and Markučiai neighborhoods. The Polish Cultural Centre at Naugarduko gatvė 76 operates entirely in Polish. Trakai, 28 kilometers west of Vilnius, hosts a small Karaim community (estimated 170 speakers in 2021) who maintain Karaim language alongside Lithuanian, visible in Karaimų gatvė restaurants and the Kenesa (Karaim house of prayer), though functional communication requires Lithuanian or English.
German has limited but specific utility in Klaipėda and the Curonian Spit due to historical ties. Klaipėda was Memel under German administration until 1923 and again from 1939 to 1945, and the region hosted German-speaking populations for centuries. In Nida, where Thomas Mann maintained a summer house from 1930 to 1932 (now the Thomas Mann Memorial Museum), some guesthouse operators and restaurant staff maintain German for visitors from Germany who arrive via the Kiel-Klaipėda ferry operated by DFDS. The Neringa municipality, encompassing the entire Lithuanian portion of the Curonian Spit, reports approximately 12 percent German-language capability among tourism workers in the 2020 municipal survey. This does not extend to medical facilities, police, or general services. German holds no official status and carries complicated historical associations due to Nazi occupation from 1941 to 1944.
Scandinavian languages (particularly Norwegian and Swedish) appear occasionally in Vilnius business contexts and Palanga resort area, reflecting significant Lithuanian labor migration to Norway (approximately 45,000 Lithuanians resided in Norway as of 2023 according to Statistics Norway) and historical Baltic trade connections. This does not constitute functional coverage. In Palanga, where SAS and Norwegian Air operated direct summer routes from Oslo and Stockholm until route restructuring in 2022, some hotel reception staff at properties like Palangos Vetra and Gradiali claim basic Norwegian or Swedish. This is entrepreneur-specific, not systematic.
Medical facilities operate primarily in Lithuanian. Vilnius University Hospital Santaros Klinikos maintains an International Patient Department with English-speaking coordinators for scheduled procedures but emergency services (Greitoji medicinos pagalba, dial 112) function in Lithuanian, with English available if an English-speaking dispatcher is on shift, which is not guaranteed. Outside Vilnius, medical communication defaults to Lithuanian. The State Health Care Accreditation Agency recommends travelers carry written Lithuanian translations of medical conditions and medication names.
Pharmacies (vaistinė) display a green cross and operate with Lithuanian-only service outside major cities. In Vilnius, Eurovaistinė chains and Camelia pharmacies employ some English speakers, identifiable by flag pins on name badges. Medication names differ from American proprietary names: paracetamol rather than Tylenol, ibuprofenum rather than Advil. Prescription requirements are stricter than in the United States for antibiotics and controlled substances. The Lithuanian State Medicines Control Agency maintains an English-language database at vvkt.lt for medication verification, but pharmacists themselves communicate in Lithuanian.