Hollola (Finnish pronunciation: [ˈholːolɑ]) 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 23,087 (31 December 2021) 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 49.84 inhabitants per square kilometre (129.1/sq mi). Hollola has the tallest structure in Finland, the Tiirismaa TV-Tower.