| Cıfıtkalesi Islet | |
| Native Name: | Cıfıtkalesi Adası |
| Native Name Lang: | Turkish |
| Map: | Turkey |
| Coordinates: | 38.0456°N 26.855°W[1] |
| Country: | Turkey |
| Country Admin Divisions Title: | İl (province) |
| Country Admin Divisions: | İzmir Province |
| Country Admin Divisions Title 1: | İlçe |
| Country Admin Divisions 1: | Seferihisar |
Çıfıtkalesi Islet (literally "Jewish Castle Island") is an uninhabited Aegean islet in Turkey.
The islet is administratively a part of Seferihisar ilçe (district) of İzmir Province. It is very close to mainland (Anatolia); the closest point to mainland is less than . The longest dimension of the islet is about .[2]
In antiquity the islet was connected to the mainland and was called Myonessus (Greek, Ancient (to 1453);: Μυόννησος, meaning mouse island). Currently, the connection has been broken, but the sea level is shallow and it is possible to walk to the islet. Parts of the defensive wall are preserved on the island.[3]