Kyra Panagia (), also Kira Panagia or Kira Panayia, is a Greekisland in the Sporades. It is administratively part of the municipality of Alonnisos in Magnesia Prefecture. The island is also known by the name of Pelagos and rarely Pelagonisi. In Antiquity it was known as Ephthyros (Έφθυρος) and Polyaigos (Πολύαιγος). The bay near the island is named Agios Petros.
Nearest islands and islets
Its nearest islands and islets are Gioura to the northeast and the main island of Alonnisos to the southwest.
The 1991 census read only one inhabitant making it the smallest municipal district in Greece in population. The tiny settlement became abandoned in the mid to late-1990s. The 2001 census reported a population of ten inhabitants.