St. Joseph's Church, Jesuit church in Poljane, Ljubljana, Slovenia

St. Joseph's Church is a Neo-Romanesque Jesuit church on Ulica Janeza Pavla II in the Poljane district of Ljubljana. At 68.5 m it is the longest church in the Archdiocese of Ljubljana, has the largest dome and the second-highest bell tower. The nave interior is covered by a barrel vault with a half-dome over the apse.

Bishop Jakob Missia called for a new Jesuit-run church after the 1895 Ljubljana earthquake, intended for annual commemorations of the quake and prayers against earthquakes. Bishop Anton Bonaventura Jeglič blessed the foundation stone on 4 August 1912, and the building was largely finished by 1914 to plans by the Austrian Benedictine architect Anselm Werner. The Austro-Hungarian army then used it as a barracks for 200 soldiers and a food store until 1921; Jeglič blessed the church the following year.

The church belongs to the Duhovno središče svetega Jožefa spiritual centre, served by Jesuits, and lies in the territory of the Ljubljana–Sv. Peter parish. Its five iron bells were cast at the Kranjska Industrijska Družba foundry in Jesenice and are tuned c1–d1–e1–g1–b1, occupying the top two floors of the tower; an earlier set came from the Samassa foundry.

The church stands on Ulica Janeza Pavla II, formerly Ulica Zrinjskega, in the Poljane district. It belongs to the Jesuit Spiritual Centre of St. Joseph, which runs a student residence and a retreat house; the retreat house next to the residence was built to Jože Plečnik's plans in 1925. Visitors should note that the building is an active Jesuit college, not a museum.

From 1949 the nationalised church housed Viba film, the first Slovenian film studio, which operated there until 1991; the building later served as a store for film sets. A 2006 documentary, Film pred oltarjem by Metod Pevec, records this chapter of its history.