Allagi (Greek: Αλλαγή) is a village in the municipality of Oichalia, in the northern part of the prefecture of Messenia, Greece. It is located on a major highway linking Kalamata and Corinth, the GR-7/E65. Megalopoli is about 20 km northeast, Kyparissia about 35 km west, Pyrgos is about 90 km northwest and Kalamata about 30 km south.
| Year | Population |
|---|---|
| 1991 | 135 |
| 2001 | 143 |
The community has a small school, a church, a restaurant, a post office and a square(plateia). The nearest train station is SW. Local streets are grid.
Fertile lands dominate and surround most of Allagi while forests are found to the west. Rocky mountains with a few bushes are found to the east and north including the Taygetus mountain range. Olive groves are common in the west and north. The place had a mine slightly east.