Olenia (Greek: Ωλενία) is a former
municipality in
Achaea,
West Greece,
Greece. Since the 2011 local government reform it is part of the municipality
West Achaea, of which it is a municipal unit. Population 6,822 (2001). The seat of the municipality was in
Lousika. The municipality is named after the ancient
Achaean town
Olenus.