The Constitution of Finland is the supreme source of national law of Finland. It defines the basis, structures and organisation of government, the relationship between the different constitutional organs, and lays out the fundamental rights of Finnish citizens, and individuals in general. The original Constitution Act was enacted in 1919, soon after Finland declared its independence in 1917. The current draft of the Constitution came into force on 1 March 2000.

The prime minister of Finland is the leader of the Finnish Government. The prime minister and their cabinet exercise executive authority in the state. The prime minister is formally ranked third in the protocol after the president of Finland and the speaker of the Parliament. Finland's first prime minister, Pehr Evind Svinhufvud, was appointed on 27 November 1917, just a few days before the country declared its independence.