Novi Klošter (from German: Neukloster > "The New Cloister") is a former Dominican priory near Polzela (Slovenia), built in the mid-15th century by Frederick II, Count of Celje.

The monastery had a chequered history, having been invaded by the Ottomans shortly after its foundation, attacked by peasants, used as a fortress and novitiate, and much of the building damaged by fire.

[1] The founding of the priory is closely linked to the Counts of Celje, as it was erected in the hunting grounds of Frederick II, who issued the foundation charter in 1453.

With the consent of the Patriarch of Aquileia, Ludovico Trevisan, and Pope Nicholas V, he donated the monastery with the church and the nearby estates to the Dominican Order.

[2] The Dominicans were Frederick's confessors towards the end of his life and, according to the historian Jože Mlinarič, it is likely that the monastery was founded so"that the Dominicans should become the guardians of his earthly remains and the prayers for the repose of his soul, which was burdened with so many vices.«[3] After the extinction of the Counts of Celje, the Habsburg emperor Frederick III confirmed the friars' rights and estates in 1459.

In the late 15th century, the vicar general of Aquileia reconsecrated the altar and called on the faithful to help fortify the monastery and protect it from further attacks.

[4] After being rebuilt in the 16th century, it served as a fortress with a defensive wall, moat and five towers, but repeated attacks and high taxes left it in material distress.

"[7] In 1635, during the Second Slovene Peasant Revolt, it was occupied and plundered by local inhabitants, who rebelled against the Dominicans for excessive taxes and socage.

In the mid-18th century, the complex was struck by lightning and damaged by fire, which destroyed the bell tower and part of the church of Our Lady, as well as most of the buildings.

The Gothic statue of the Virgin Mary with Jesus, or the seated Madonna, which is now in the Church of St Peter in Šempeter, and the organ, which was transferred to Stranice, preserved.

[12] After the dissolution, the education of the local population continued in the monastery facilities until 1794, when the elementary school (trivialka) was moved to Polzela.

Surrounded by a park of exotic trees and ponds dating back to monastic times, he successfully managed the estate with dairy cattle, arable crops and hops.