Constitution Day in Belarus is a public holiday that is celebrated in the Republic every year on March 15, according to the Decree of the President of the Republic dated March 26, 1998 №157. The first Constitution of the Soviet Socialist Republic of Belarus (SSRB) was adopted at the 1st Congress of Soviets of Belarus on Feb 3, 1919. Its content was permeated with the idea of the dictatorship of the proletariat, which was enshrined in the Constitution itself. Later on, it changed many times. In July 27, 1990 the Declaration of the Supreme Council "On state sovereignty of the Republic of Belarus" was adopted. The Declaration proclaimed the "full state sovereignty of the Republic of Belarus as supremacy, independence and national sovereignty of the Republic within the boundaries of its territory, the legitimacy of its laws, the Republic's independence in foreign relations".

Further, on August 25, 1991, by special law the Declaration on state sovereignty was given the status of constitutional law, on the basis of which were made changes and additions in the Constitution of 1978.

 The development of the new constitution of the Republic of Belarus was carried out in such legal and political environment and was adopted in March 15, 1994 The Constitution consists of a preamble, 9 chapters, where are 8 chapters and 146 articles.