Hollola is a municipality of Finland, located in the western part of the Päijänne Tavastia region. The municipality is unilingually Finnish and has a population of 22,885 and covers an area of 727.47 square kilometres (280.88 sq mi) of which 68.66 km2 (26.51 sq mi) is water. The population density is 35.13 inhabitants per square kilometre (91.0/sq mi).

Päijät-Häme is a region in Southern Finland south of the lake Päijänne. It borders the regions of Uusimaa, Kanta-Häme, Pirkanmaa, Central Finland, South Savo and Kymenlaakso. The biggest city in the region is Lahti.