| Yılan Island (Da Vinci Island) | |
| Native Name Lang: | Turkish |
| Map: | Turkey |
| Coordinates: | 38.3311°N 26.6775°W |
| Location: | Aegean Sea |
| Area M2: | or |
| Area Ha: | --> |
| Country: | Turkey |
| Country Admin Divisions Title: | İl (province) |
| Country Admin Divisions: | İzmir Province |
| Country Admin Divisions Title 1: | İlçe |
| Country Admin Divisions 1: | Urla |
Yılan Island or Da Vinci Island (literally "Snake Island") is an Aegean island of Turkey. It was formerly known in Greek as Nisida Erimo (Νησίδα Έρημο).
Administratively it is a part of Urla ilçe (district) of İzmir Province at 38.3311°N 26.6775°W.[1] It is almost at the center of Gülbahçe bay. The distance to the nearest point at the main land is about . The longest dimension of the uninhabited island is about .