|Administrative region||West Greece|
|Elevation||65 m (213 ft)|
|• Population||632 (2011)|
|Time zone||EET (UTC+2)|
|• Summer (DST)||EEST (UTC+3)|
|Postal code||252 00|
Lousika (Greek: Λουσικά) is a village in Achaea, Greece. It is located 5 km southeast of Kato Achaia, 3 km south of Alissos, and 20 km southwest of Patras. In 2001 Lousika had a population of 454 for the village and 632 for the community, which 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|
- Stamatios Douvos, (1983-), writer, philosopher, historian
- Nikolaos Kontopoulos, (1889–1958 in Athens), writer
- "Απογραφή Πληθυσμού - Κατοικιών 2011. ΜΟΝΙΜΟΣ Πληθυσμός" (in Greek). Hellenic Statistical Authority.