Cuba is communist and has had a socialist political system since 1961 based on the "one state, one party" principle. Cuba is constitutionally defined as a single-party Marxist–Leninist socialist republic with semi-presidential powers. The present Constitution of Cuba, approved in a referendum on 24 February 2019, also describes the role of the Communist Party of Cuba to be the "leading force of society and of the state" and as having the capability of setting national policy, and the first secretary of the Communist Party is the most powerful position in Cuba. The 2019 Constitution of Cuba states it is guided by the examples of Cuban independence hero José Martí and revolutionary leader Fidel Castro and the ideals of Marx, Engels, and Lenin.
The president of Cuba is Miguel Díaz-Canel, who succeeded Raúl Castro as first secretary of the Communist Party in 2021. Executive power is exercised by the government, which is represented by the Council of Ministers, headed by the prime minister of Cuba. Legislative power is exercised through the unicameral National Assembly of People's Power, which is constituted as the maximum authority of the state. With effect from 10 October 2019, Miguel Díaz-Canel is the president and Manuel Marrero is the prime minister of Cuba. The previous president of the State Council was Raúl Castro, brother of former leader Fidel Castro; Raúl Castro remained First Secretary of the Communist Party of Cuba, and commander-in-chief of the Revolutionary Armed Forces until 19 April 2021. Fidel Castro ruled from 1959 to 2006, before illness forced him to hand power to his brother. Esteban Lazo Hernández is the president of the National Assembly.