Saint Mercurius Church in Coptic Cairo

Saint Mercurius Church (Coptic: ⲙⲁⲣⲕⲟⲩⲣⲓⲟⲥ ⲧⲁⲧⲣⲁⲡⲩⲗⲱⲛ ⲙ̀ⲫⲓⲟⲙ) (Arabic: كنيسة أبو سيفين, romanized: Kanīsat ʔabū Sayfayn) in Coptic Cairo is a Coptic Orthodox church situated just to the north of the Babylon Fortress in Old Cairo among a group of important churches, and within the area known as the Abu Sayfayn Cloister is to be found three churches and a convent. One of these churches, dedicated to Saint Mercurius, and is the largest in the district of ancient Babylon.

The church is named after St. Philopater Mercurius who is known as Abu Sayfayn ("double sworded").