The Constitution of the Republic of Bulgaria (Bulgarian: Конституция на Република България, Konstitutsia na Republika Balgaria) is the supreme and basic law of the Republic of Bulgaria. The current constitution was adopted on 12 July 1991 by the 7th Grand National Assembly of Bulgaria, and defines the country as a unitary parliamentary republic. It has been amended five times (in 2003, 2005, 2006, 2007, and 2015).

Chronologically, it is the fourth constitution of Bulgaria, the first being the Tarnovo Constitution of 1879. It was immediately preceded by the two Socialist-era constitutions–the Dimitrov Constitution (named after Georgi Dimitrov), in force between 1947 and 1971, and the Zhivkov Constitution (named after Todor Zhivkov), in force between 1971 and 1991.

On September 2, 2020, the Draft Constitution of Bulgaria from 2020 was submitted to the National Assembly