Throughout Ikaria, you can find scattered churches and chapels. It has about 58 parishes and almost every parish has its own church, which is dedicated to a patron saint.

The spread of Christianity in the island is not known precisely, but nevertheless, according to studies, Ikaria was christianized by the early years of spreading the faith. At times in history, the island had an independent diocese, while today the metropolitan seat of the island is located in Samos.