Solomon West Ridgeway Dias Bandaranaike, also known as "The Silver Bell of Asia", was a Ceylonese statesman who served as the fourth Prime Minister of the Dominion of Ceylon, serving from 1956 until his assassination. The founder of the left-wing and Sinhalese nationalist Sri Lanka Freedom Party, his tenure saw the country's first left-wing reforms.

The Prime Minister of the Democratic Socialist Republic of Sri Lanka is the head and most senior member of parliament in the cabinet of ministers. It is the second-most powerful position in Sri Lanka's executive branch behind the president, who is the constitutional chief executive. The Cabinet is collectively held accountable to parliament for their policies and actions.