The Sa`i al-Bahr Mosque is one of the mosques established during the Ayyubid dynasty in Egypt. It is located on Sa`i al-Bahr Street in Old Cairo.
It is a small mosque consisting of a rectangle with four rows of ancient marble columns, topped by a flat roof. On the eastern side of it is the qiblah, and in the southern corner there is the tomb of Sheikh Muhammad Sa`i al-Bahr and his brother Jaafar. The main entrance to the mosque is located in the southern façade, which is surmounted by the minaret of the mosque. It appears from the obelisk-like minaret that the mosque was renovated and rebuilt in the Ottoman era.