Kastellorizo or Castellorizo ( - Kastellorizo, officially Μεγίστη - Megísti or Meyísti) is a Greek island and municipality located in the southeastern Mediterranean. It lies roughly off the south coast of Turkey, about southeast of Athens and east of Rhodes, almost halfway between Rhodes and Antalya and to Cyprus. Kastellorizo is part of the Rhodes regional unit.

Kastellorizo or Castellorizo ( - Kastellorizo, officially Μεγίστη - Megísti or Meyísti) is a Greek island and municipality located in the southeastern Mediterranean. It lies roughly off the south coast of Turkey, about southeast of Athens and east of Rhodes, almost halfway between Rhodes and Antalya and to Cyprus. Kastellorizo is part of the Rhodes regional unit.