Dubingiai Castle () was a residential castle in Dubingiai, MolÃÂtai district, Lithuania.
The first masonry castle was constructed by Vytautas, Grand Duke of Lithuania, in 1412-1413 on an island, now a peninsula, in Lake Asveja in order to secure the capital Vilnius from attacks from Livonia. No accounts concerning the architecture of Vytautas' castle have survived. It was acquired by Jerzy Radziwià Âà  (Jurgis Radvila) prior to 1508. He constructed a new palace in the Renaissance style in the first half of the 16th century. After the death of Jerzy, his son Mikolaj "the Red" inherited the property, causing the town nearby to become an important hub for the Reformation in Lithuania. Barbara Radziwià Âà  (Barbora RadvilaitÃÂ) spent five months in the castle after her marriage to Sigismund Augustus in 1547. The palace used to be one of the most luxurious residences in the Grand Duchy, lagging not much behind the Royal Palace. Dubingiai Castle was the main seat of the Birà ¾ai-Dubingiai line of the Radziwià Âà  (Radvilos) family until the second half of the 17th century, when it was transferred to Birà ¾ai Castle.
During the PolishâÂÂLithuanian-Swedish wars, the castle was pillaged by armies loyal to the King of Poland and Grand Duke of Lithuania. It was confiscated from Bogusà Âaw Radziwià Âà  (Boguslavas Radvila). It returned to the family in the second half of the 17th century. The neglected castle and church gradually fell into ruins. It was sold to Michaà  Tyszkiewicz (Mykolas Tià ¡keviÃÂius) in 1808. Today only the foundations and several cellars of the castle and church remain and are being researched.
The masonry Calvinist Church of the Holy Spirit was built in the Renaissance style near the castle by Janusz Radziwià Âà  (Jonuà ¡as Radvila) prior to 1620 and was intended to be the mausoleum of the Radziwià Âà  family. The most prominent members of the family were interred there, including Mikoà Âaj "the Black" Radziwià Âà  (Mikalojus Radvila Juodasis) in 1565 and his wife Elà ¼bieta Szydà Âowiecka in 1562, Mikoà Âaj "the Red" Radziwià Âà  (Mikalojus Radvila Rudasis) in 1584 and Janusz Radziwià Âà  in 1620. Their remains were discovered during archaeological excavations in 2004 and reburied there on 5 September 2009.
In 2024 a fund "Dubingià ³ pilies fondas" was established with a goal to rebuild the castle in the near future. The idea of the restoration is actively supported by the representative of the Radvila family, Duke Motiejus Radvila (Maciej Radziwill), who is among the founders of the fund, along with Prof. Albinas KunceviÃÂius, Dr. Vydas Dolinskas, who was in charge of the restoration of the Palace of the Grand Dukes, and MolÃÂtai District Municipality.