Ignoto bažnyčia) is a religious building of the Roman Catholic Church that serves as the cathedral of the Military Ordinariate of Lithuania.

The first Jesuits arrived in Vilnius in 1602, they opened an internship in the city, and began construction of the church of St. Ignatius in 1622 in the Baroque style.

The fire of 1748 devastated Vilnius and numerous historic buildings, including the church of St. Ignatius.

In 1925, the church became a place of worship for the Polish garrison and the interior was renovated with new fresh, instead of the old decorations that were lost.

The church was closed in 1945 when Vilnius was incorporated into the Lithuanian Soviet Socialist Republic, and used as a cinema and a concert hall of the Philharmonic Orchestra of the city, while the monastery became a technical library.