| Marmaronisi | |
| Native Name: | Μαρμαρονήσι |
| Native Name Lang: | el |
| Coordinates: | 37.4922°N 25.3667°W |
| Map: | Greece |
| Archipelago: | Cyclades |
| Country: | Greece |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | South Aegean |
| Country Admin Divisions Title 1: | Regional unit |
| Country Admin Divisions 1: | Mykonos |
| Country Admin Divisions Title 2: | Municipality |
| Population: | 0 |
| Population As Of: | 2001 |
| Postal Code: | 846 00 |
| Area Code: | 22890 |
| Registration Plate: | EM |
Marmaronisi (Μαρμαρονήσι) is a small uninhabited rock island on the northern side of Mykonos in the Cyclades.[1] [2] It is located at the entrance of the bay of Panormos and opposite the settlement of Agios Sostis.[3]
Marmaronisi is named for its composition of the rocks of the island, which is also suitable for manufacturing lime.[4]