| Petalida | |
| Native Name: | Πεταλίδα |
| Native Name Lang: | el |
| Coordinates: | 35.6006°N 23.5894°W |
| Archipelago: | Cretan Islands |
| Country: | Greece |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | Crete |
| Country Admin Divisions Title 1: | Regional unit |
| Country Admin Divisions 1: | Chania |
| Country Admin Divisions Title 2: | Municipality |
| Population: | 0 |
| Population As Of: | 2001 |
Petalida (Greek, Modern (1453-);: Πεταλίδα, "limpet"), also known as Xera (pronounced "ksera"), is an islet close to the northern coast of Crete in the Aegean Sea. It is located between the island of Imeri Gramvousa and the mainland. Administratively, it is located within the municipality of Kissamos, in Chania regional unit.