| Vathy | |
| Name Local: | Βαθύ |
| Periph: | South Aegean |
| Periphunit: | Milos |
| Municipality: | Sifnos |
| Community: | Apollonia |
| Population As Of: | 2021 |
| Population: | 75 |
Vathy is a small seaside village in Sifnos, Greece. According to the 2021 Greek census it had a population of 75 permanent residents. It is located on the southwest coast of the island facing the neighboring island of Kimolos.
Vathy belongs to the community of Apollonia of the municipality of Sifnos, which in turn belongs to Milos regional unit of the South Aegean administrative unit.