Askola is a municipality of Finland. It is located in the Uusimaa region. The municipality has a population of 4,700 and covers an area of 218.03 square kilometres (84.18 sq mi) of which 5.61 km2 (2.17 sq mi) is water. The population density is 22.12 inhabitants per square kilometre (57.3/sq mi). Monninkylä is the largest village of the municipality in terms of population. Neighbouring municipalities are Myrskylä, Mäntsälä, Pornainen, Porvoo and Pukkila.

The municipalities represent the local level of administration in Finland and act as the fundamental, self-governing administrative units of the country. The entire country is incorporated into municipalities and legally, all municipalities are equal, although certain municipalities are called cities or towns. Municipalities have the right to levy a flat percentual income tax, which is between 16 and 22 percent, and they provide two thirds of public services. Municipalities control many community services, such as schools, health care and the water supply, and local streets. They do not maintain highways, set laws or keep police forces, which are responsibilities of the central government.