The Constitution of the Republic of Belarus is the ultimate law of Belarus. Adopted in 1994, three years after the country declared its independence from the Soviet Union, this formal document establishes the framework of the Belarusian state and government and enumerates the rights and freedoms of its citizens. The Constitution was drafted by the Supreme Soviet of Belarus, the former legislative body of the country, and was improved upon by citizens and legal experts. The contents of the Constitution include the preamble, nine sections, and 146 articles.

The structure and substance of the Constitution were heavily influenced by constitutions of Western powers and by Belarus' experiences during the Soviet era. While much of the Constitution establishes the government's functions and powers, an entire section details rights and freedoms granted to citizens and residents. The Constitution has been amended twice since the original adoption, in 1996 and in 2004. Two referendums that were disputed by independent observers and government opposition leaders increased the power of the presidency over the government and eliminated the term limits for the presidency.