Religion in Lithuania
As per the 2011 census, the predominant religion in Lithuania is Christianity, with the largest confession being Roman Catholicism. Lithuania was the last pagan country in Europe, with the Roman Catholic Church becoming widely accepted only in the late 14th century. In the early 21st century, about 77% of the population is Roman Catholic according to the 2011 census. There are also smaller groups of Evangelical Lutherans and Reformed churches other Protestants, as well as people of other faiths. Some elements of the ancient Lithuanian pagan religion survives in the countryside, mingled with Christianity.
According to the 2005 Eurobarometer Poll, regarding the question of religious or spiritual beliefs, 49% of Lithuanian citizens responded that "they believe there is a God", 36% answered that "they believe there is some sort of spirit or life-force" and 12% answered that "they do not believe there is any sort of spirit, God, or life-force".
Population by religious confession
As per the 2011 census:
- Roman Catholic – 77.2% (2,350,478)
- Orthodox – 4.1% (125,189)
- Orthodox (Old Believers) – 0.8% (23,330)
- Evangelical Lutherans – 0.6% (18,376)
- Evangelical Reformed – 0.2% (6,731)
- Sunni Muslim - 0.1% (2,727)
- Judaic – 0.04% (1,229)
- Greek Catholics (Unites) – 0.02% (706)
- Karaites – 0.01% (310)
- Other religions – 0.7% (19,926)
- No religion – 6.1% (186,670)
- Did not specify – 10.1% (307,757) 
As per the 2011 census, 77.2% of Lithuanians belong to the Roman Catholic Church  Roman Catholicism has claimed the adherence of the majority of Lithuania since the Christianization of Lithuania in the 14th and 15th centuries. Lithuania kept her Catholic identity under the Russian Empire and later under the Soviet Union when some Catholic priests led the resistance against the Communist regime, which is commemorated in the Hill of Crosses near Šiauliai, a shrine to the anti-communist resistance. Political activity has continued after independence against socialism and liberalism, especially in ethical questions.
Lutheranism in Lithuania dates back to the 16th century, when it came mainly from the neighbouring German-controlled areas of Livonia and East Prussia. A Synod in Vilnius united the church in 1557. The parish network covered nearly all of the Grand Duchy, with district centers in Vilnius, Kedainai, Biržai, Slucke, Kojdanove and Zabludove later Izabeline. Small Protestant communities are dispersed throughout the northern and western parts of the country.
The majority of Prussian Lithuanians living in East Prussia and in Memelland (since 1945 the Klaipėda Region of Lithuania) belonged to the Evangelical Church of the old-Prussian Union. Most resettled in the West Germany after World War II along with the ethnic German inhabitants.
Since 1945 Lutheran Protestantism in Lithuania has declined.
The Lithuanian Evangelical Reformed Church is a historic denomination it was founded in 1557. Notable member was Szymon Zajcusz. In the second half of the 16th century the Unitarians separated. The denomination has over 7000 members in 14 congregations. The church is a member of the World Communion of Reformed Churches and the World Reformed Fellowship
In Lithuania, Islam has a long history unlike many other northern European countries. The medieval Grand Duchy of Lithuania of the Polish–Lithuanian Commonwealth allowed Muslims, notably the Crimean Tatars to settle in the lands in the south. Some of people from those lands were moved into ethnically Lithuanian lands, now the current Republic of Lithuania, mainly under rule of Grand Duke Vytautas. The Tatars, now referred to as Lithuanian Tatars, lost their language over time and now speak Lithuanian as natives; however, they have strongly maintained their Muslim faith.
The Lithuanian Jewish community has roots that go back to before the time of the Grand Duchy of Lithuania. Lithuania was historically home to a large Jewish community and an important center of Jewish scholarship and culture from the 18th century until the community was almost entirely eliminated during the Holocaust. Before World War II, the Lithuanian Jewish population numbered some 160,000, about 7% of the total population. Vilnius alone had a Jewish community of nearly 100,000, about 45% of the city's total population with over 110 synagogues and 10 yeshivot in the city.
According to a Karaite tradition several hundred Crimean Karaites were invited to Lithuania by Grand Duke Vytautas to settle in Trakai ca. 1397. A small community remains in Trakai today, which has preserved the Turkic Karaim language and distinctive customs, such as its traditional dish called "kibinai", a sort of meat pastry, and its houses with three windows, one for God, one for the family, and one for Grand Duke Vytautas.
Medieval Lithuania was the last pagan nation in Europe, officially converting in the 14th century. The neo-pagan movement Romuva, established in 1967, attempts to reconstruct and revive Lithuanian paganism.
- European Union. "Eurobarometer on Social Values, Science and technology 2005 - page 11" (PDF). Retrieved 2007-05-05.
- Department of Statistics to the Government of the Republic of Lithuania. "Ethnicity, mother tongue and religion".. 2013-03-15.
- "Population by religious community indicated, municipalities".. 2013-03-15.
- Foreword to the past: a cultural history of the Baltic people by Endre Bojtár, p. 140
- (Lithuanian) "Romos katalikų daugiausia". Department of Statistics to the Government of the Republic of Lithuania. 2002-11-07.
- (English) United Methodists evangelize in Lithuania with ads, brochures
- (English) Baptist beginnings in Lithuania.
- (English) Graduation: Lithuania Christian College
- (English) World Venture. Lithuania.
- Islamic peoples of the Soviet Union, by Shirin Akiner, pg. 85
- The Virtual Jewish History Tour - Vilnius
- Vilnius, Jerusalem of Lithuania
- (Lithuanian) "Gyventojai pagal tautybę ir tikybą". Department of Statistics to the Government of the Republic of Lithuania.
- Lithuanian population by ethnicity
- A history of pagan Europe by Prudence Jones, Nigel Pennick, p. 173