Saint Basil of Ostrog Monastery, Serbian Orthodox monastery in Bijeljina, Bosnia and Herzegovina.

Saint Basil of Ostrog Monastery occupies a walled complex of about 3,500 m² in central Bijeljina, with the church at its centre and a bell tower over 30 metres tall carrying a clock. The tower is visible from every side of the city and serves travellers as a landmark. Around the church stand connected buildings holding a 400 m² museum, a refectory, a library, lecture hall, monks' cells and a candle chapel with an icon and souvenir shop.

Construction began in 1996 and the whole complex was finished in 2001; it was consecrated on 12 May 2001 in the presence of 19 bishops of the Serbian Orthodox Church. Bishop Vasilije of Zvornik-Tuzla led the project through every phase, after wartime conditions forced him to leave Tuzla. The monastery church holds a covering with relics of St. Basil of Ostrog and part of the relics of St. Sisoes the Great.

The monastery holds a copy of the Three-Handed Theotokos icon, a gift from Hilandar Monastery on Mount Athos, and relics of St. Basil of Ostrog and St. Sisoes the Great. Its first patronal feast was sponsored by Slobodan and Mira Pavlović, donors from Semberija. The 30-metre clock tower serves as a landmark for travellers crossing Bijeljina.

The monastery is centrally located in Bijeljina and easily accessible on foot with regular daily opening hours for visitors. Religious prayer times should be respected, as they structure the day and may sometimes limit touring opportunities.

The 30-metre clock tower rising above the complex is visible from every approach to Bijeljina and serves travellers as a landmark. Inside the church, before the altar, lie a covering with relics of St. Basil of Ostrog and part of the relics of St. Sisoes the Great, alongside a copy of the miracle-working Trojeručica icon given by Hilandar monastery.