The Constitution of Samoa is a written constitution which is the supreme law in Samoa. It establishes Samoa as a parliamentary republic with a Westminster system and responsible government. It outlines the structure and powers of the Samoan government's three parts: the executive, legislature, and . The constitution was drafted by a pair of constitutional conventions in 1954 and 1960. The final draft was approved by a referendum in 1961, and came into force when Samoa became independent on 1 January 1962.