Basil of Ostrog (Serbian: Свети Василије Острошки, romanized: Sveti Vasilije Ostroški, pronounced [sʋê:ti ʋǎsiːlije ǒstroʃki]; 28 December 1610 – 29 April 1671), also known as Vasilije,[1] was a Serbian Orthodox bishop of Zahumlje who is venerated as a saint in the Eastern Orthodox Church.

Stojan Jovanović (Serbian Cyrillic: Стојан Јовановић) was born on 28 December 1610, in the village of Mrkonjići at the Popovo field in the Ljubinje nahija (Herzegovina), at the time part of the Ottoman Empire.

His tomb in a cave-church soon became a site of pilgrimage for Christians (both Orthodox and Roman Catholic) and Muslims who were drawn by reports of miracles occurring through the intercession of the saint.

The Monastery is now one of the major pilgrimage sites in the Balkans, and large numbers of pilgrims gather, particularly at Pentecost.

Vladimir Kecmanović wrote the poem Ognjen i kelija (2024), inspired by the life of Basil of Ostrog.