莱希亚是芬兰的城镇，位于该国西部，由博滕区负责管辖，距离瓦萨25公里，始建于1576年，面积508.38平方公里，2013年人口8,028，人口密度为每平方公里15.92人。

Laihia (Swedish:Laihela) is a municipality of Finland, founded in 1576 through a separation from Isokyrö and Korsholm. It is located in the province of Western Finland and is a part of the Ostrobothnia region. The municipality has a population of 8,103 (30 June 2015) and covers an area of 508.38 square kilometres (196.29 sq mi) of which 4.14 km (1.60 sq mi) is water. The population density is 16.07 inhabitants per square kilometre (41.6/sq mi). Laihia consists of 37 villages.