| Kato Vlasia | |
| Name Local: | Κάτω Βλασία |
| Coordinates: | 38°N 75°W |
| Elevation: | 803 |
| Periph: | West Greece |
| Periphunit: | Achaea |
| Municipality: | Kalavryta |
| Municunit: | Kalavryta |
| Population As Of: | 2021 |
| Pop Community: | 65 |
| Postal Code: | 250 13 |
| Area Code: | 27430 |
Kato Vlasia (Greek: Κάτω Βλασία) is a mountain village and a community in the municipality of Kalavryta, Achaea, Greece. The community consists of the villages Kato Vlasia, Menychtaiika and Metochi. It is situated at about 800 m elevation. near the source of the river Selinountas, east of the highest summit of Mount Erymanthos. It is 1 km north of Ano Vlasia, 16 km southeast of Chalandritsa and 17 km west of Kalavryta.
| Year | Village population | Community population | |
|---|---|---|---|
| 1981 | 259 | - | |
| 1991 | 193 | - | |
| 2001 | 218 | 280 | |
| 2011 | 115 | 131 | |
| 2021 | 61 | 65 |