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 604 for the village and 793 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.