One of the two preserved mosques in Niš, it is located in the central part of the Fortress. It was probably built by the beginning of the 16^th century, from when the first records of this mosque date. It was founded by Bali-Beg, the administrator of the city of Niš at the time. The western part of the Fortress was named Bali-Bey’s district after the mosque. The minaret was built in the 17^th century, and near the former entry porch, next to the northern wall of the mosque, there was an extension housing the library, whose archeological remains were found.

The mosque has a square layout, and is covered with a semi-cupola. It has a mihrab (or niche) oriented towards Mecca. Over the entrance there is a porch with two domes, four arches and three columns. The minaret once used to be to the right of the entrance. It was built out of dressed stone framed with brick, and there are pointed masonry arches above the windows.

Bali-Bey’s mosque is a significant monument of Islamic architecture in Serbia, both for its architectural value and for the period in which it was built.

The reconstruction to the monument was finished in 1978, according to the designs of the architect Danica Janić, and is nowadays being used as the exhibition space “Salon 77”.