I have been asked to write a report for the International Center of Medieval Art newsletter concerning recent events in Turkey whereby Byzantine churches that long have held the status of state museums and cultural heritage sites are being converted into mosques. It is crucial to raise awareness about this very critical issue. The examples include the church of the Hagia Sophia in Iznik (Nicea), the church of the Hagia Sophia in Trabzon (Trebizond), and the plans for the church and associated monastic complex of St. John Stoudios in Istanbul (Constantinople). Although these events have been ongoing for quite some time, the world started watching more closely in recent months when certain representatives of the Turkish government publicly called for the conversion of THE Hagia Sophia in Istanbul. For every example, the original Byzantine church building testifies to the vast contribution of Byzantine culture and civilization to the history of medieval art and architecture and world architecture more broadly. These churches were converted into mosques under Ottoman rule and subsequently into museums under the Turkish Republic.