Patmos (Greek: Πάτμος, pronounced [ˈpatmos]) is a Greek island in the Aegean Sea. It is famous as the place where, according to Christian belief, John of Patmos received the vision found in the Book of Revelation of the New Testament, and where the book was written.
One of the northernmost islands of the Dodecanese complex, Patmos has a population of 3,283 (2021) and an area of 34.05 km (13.15 sq mi). The highest point is Profitis Ilias, 269 metres (883 ft) above sea level. The municipality of Patmos, which includes the offshore islands of Arkoi (pop. 44), Marathos (pop. 5), and several uninhabited islets, has a population of 3,047 (2011 census) and a combined land area of 45.039 square kilometres (17.390 sq mi). It is part of the Kalymnos regional unit.