Agia Eirini (, for Saint Irene) is a community in the municipal unit of Eleios-Pronnoi in the southeastern part of the island of Cephalonia, Greece. It is situated in an inland valley, at about 90 m elevation. It is 2 km south of Tzanata, 3 km southeast of Xenopoulo, 3 km north of Pastra and 4 km southwest of Poros. It is located on the road connecting Poros with Argostoli.
Historical population
{| class="wikitable"
! Year !! Population
|-
| 1981 || 284
|-
| 1991 || 306
|-
| 2001 || 363
|-
| 2011 || 314
|-
| 2021 || 294
|}
See also
- List of settlements in Cephalonia