The Sultan al-Nasir Muhammad ibn Qala'un Mosque is an early 14th-century mosque at the Citadel in Cairo, Egypt. It was built by the Mamluk sultan Al-Nasr Muhammad in 1318 as the royal mosque of the Citadel, where the sultans of Cairo performed their Friday prayers. The mosque is located across the street from the courtyard access to the Mosque of Muhammad Ali.