The Arba'a Rukun Mosque (), also known as Arba Rucun, is a mosque in the Shangani medieval district of Mogadishu, Banaadir, Somalia.
Built in , concurrently with the Fakr ad-Din Mosque, the Arba'a Rukun Mosque is one of the oldest Islamic places of worship in Mogadishu. The mihrab contains an inscription dated from the same year, which commemorates the name of the mosque's founder, Khusra ibn Mubarak al-Shirazi (Khusrau ibn Muhammed).