The Great Orthodox Synagogue (Sinagoga Mare Ortodoxă) is the only functioning synagogue in Oradea, Bihor County.
The synagogue was built in 1890 by the engineer Ference Knápp based on the plans of the architect Nándor Bach. The edifice has an eclectic style with Moorish decorations. It is built on a rectangular plan, with the main facade being more richly decorated than the rest of the building. The central entrance is flanked on both sides by stained glass windows finished in a circular arch.
The building has 600 seats for men in its central nave, and for women, there are 450 seats upstairs, which are masked by a wooden grill. The interior has anthropomorphic decorations, with geometric motifs and paintings that have been preserved very well. It is considered one of the most richly decorated synagogues in the former Austro-Hungarian Empire.
In 1908, a second, smaller synagogue was built in the courtyard of the premises. The Hevra Sas Synagogue, designed by the architect Lajos Incze, was for the Orthodox Jewish elite of Oradea.
Decades after World War II, a black marble Holocaust monument was installed in the yard, to commemorate the many Orthodox Jewish community members who were lost.
