Hartola is a municipality of Finland. It is located in the Itä-Häme, Päijänne Tavastia region. The municipality has a population of 2,531 (31 December 2023), which make it the smallest municipality in Päijänne Tavastia in terms of population. It covers an area of 675.38 square kilometres (260.77 sq mi) of which 132.18 km2 (51.03 sq mi) is water. The population density is 4.66 inhabitants per square kilometre (12.1/sq mi). Neighbouring municipalities are Heinola, Joutsa, Luhanka, Pertunmaa and Sysmä.

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.