Catholic Church in Lithuania

The Catholic Church in Lithuania (Lithuanian: Katalikų Bažnyčia Lietuvoje) is part of the worldwide Catholic Church, under the spiritual leadership of the Pope in Rome. Lithuania is the world's northernmost Latin Catholic-majority country. Pope Pius XII gave Lithuania the title of "northernmost outpost of Catholicism in Europe" in 1939. The Vilnius Cathedral is the most important Catholic Church in Lithuania, which was previously used for the inauguration ceremonies of Lithuanian monarchs with Gediminas' Cap, while in modern times it is a venue for masses dedicated to the elected Presidents of Lithuania after their inauguration ceremonies and giving of oaths to the Nation in the Seimas Palace.

Among the Baltic states, Lithuania is the country with the highest percentage of Catholic population. Almost three-quarters (74.19%) of Lithuania's population self-identified as Catholics in the 2021 census. The country is divided into eight dioceses including two archdioceses and a military ordinariate.

St. Casimir (Kazimieras, 1458–1484) is the only canonized saint of Lithuania. He is the patron of the country and Lithuanian youth. Polish saint Raphael Kalinowski was born in Lithuania's capital Vilnius, then controlled by the Russian Empire. Archbishop Jurgis Matulaitis-Matulevičius (1871–1927) was beatified in 1987, archbishop Teofilius Matulionis (1873–1962) was beatified in 2017.

Saint Bruno of Querfurt, a missionary bishop, was martyred in 1009 for proclaiming the Christian faith. While some historians assert that he was killed by the Lithuanians, Zigmas Zinkevičius disputes this, arguing that Bruno met his death in territories inhabited by the Yotvingians. It was in connection with this event that the name of Lithuania was first recorded.

The spread of Catholicism in Lithuania began in the 13th century. During the reign of Mindaugas (r. 1230s–1263), the Dominican Order and the Franciscans started establishing their presence in the region. In 1231, Saint Hyacinth of Poland, a Dominican, arrived in Lithuania. In 1251, a delegation sent by Mindaugas informed Pope Innocent IV of the ruler’s desire to be baptized as a Roman Catholic. The Pope warmly welcomed Lithuania’s conversion, issuing no fewer than six papal bulls on the matter. In the first half of 1251, Mindaugas, along with many of his subjects—including a portion of the Lithuanian nobility—embraced Roman Catholicism through baptism.

The baptism of the ruler marked Lithuania’s emergence as an officially Catholic nation, gaining international recognition as early as the 1250s. In response, Pope Innocent IV instructed Heidenreich, the Bishop of Chełmno, to crown Mindaugas with a royal crown in the Pope’s name. On July 6, 1253, Mindaugas was crowned King of Lithuania, and his wife, Morta, became Queen. On August 21 of the same year, the Pope appointed priest Christian as the first Bishop of Lithuania, thereby establishing the Diocese of Lithuania. According to the Lithuanian bishop Jonas Boruta,

"A separate diocese directly subordinate to the Pope is already a considerable step for the creation of an ecclesiastical province, and in the Lithuania of Mindaugas' time (if not for unfortunate political events - the murder of Mindaugas, etc.) there were all the conditions for the establishment of an ecclesiastical province as well.."

Following Mindaugas’ assassination, Treniota seized power in 1263 and ruled Lithuania for approximately a year, during which he initiated a persecution of Christians. After Treniota’s death in 1264, Lithuania came under the rule of Mindaugas’ son, Vaišvilkas (r. 1264–1267), and subsequently Mindaugas’ son-in-law, Shvarn (r. 1267–1269), both of whom adhered to the Orthodox faith. Shvarn’s reign ended amid internal power struggles, and the succeeding Grand Dukes of Lithuania reverted to pagan beliefs.