The Russian Democratic Federative Republic (Russian: Российская Демократическая Федеративная Республика, tr. Rossiyskaya Demokraticheskaya Federativnaya Respublika) was a one-day government in 1918 in the Russian Socialist Federative Soviet Republic (Russian SFSR) during the Russian Revolution of 1917. It was formally declared on 19 January 1918 when the democratically elected Russian Constituent Assembly drafted and adopted the "Resolution on the form of government of Russia", declaring Russia to be a democratic federal republic. However, the Assembly was dissolved on the same day by the All-Russian Central Executive Committee, thus making the Republic the shortest-lived state in history.
According to the constitution, Russia was declared a democratic federal republic. The fundamental basis of the state was representative democracy and federation of both national and territorial autonomous oblasts. This was in contrast to the Decembrist constitution project, which proposed a federal constitutional monarchy on an economic basis. For the first time, the unitary structure of Russia was officially abolished and the country was declared a federation, marking the start of the federalist period in Russian history.
The Constitution granted universal suffrage for all citizens of Republic aged 20 or older. This was five years lower than in the former Russian Empire.