| Lousika | |
| Name Local: | Λουσικά |
| Type: | community |
| Periph: | West Greece |
| Periphunit: | Achaea |
| Municipality: | West Achaea |
| Pop Community: | 519 |
| Population As Of: | 2021 |
| Elevation: | 65 |
| Coordinates: | 38.1°N 57°W |
| Postal Code: | 252 00 |
| Area Code: | 26930 |
| Licence: | ΑΧ |
Lousika (Greek: Λουσικά) is a village and a community in Achaea, Greece. It is located 5 km southeast of Kato Achaia, 3 km south of Alissos, and 20 km southwest of Patras. The community includes the villages Ypsili Rachi and Spaliaraiika. Lousika was the seat of the former municipality of Olenia. The river Serdini flows through the village.
| Year | Village population | Community population | |
|---|---|---|---|
| 1981 | - | 894 | |
| 1991 | 642 | - | |
| 2001 | 604 | 793 | |
| 2011 | 454 | 632 | |
| 2021 | 378 | 519 |