Islam-aga's Mosque () is the only working mosque in Nià ¡, Serbia. There is another in Nià ¡ Fortress which is converted into a gallery, and another close to the University Rectorate, that was damaged during the Anglo-American bombing of the city in 1944.
It was built in 1720 and reconstructed in 1870. Of the twenty mosques in Nià ¡ during Ottoman rule, it is the only one that remains in use. It was torched during riots on 17 March 2004, and reconstructed in its original shape in August 2013.