The 1945 Constitution of the Unitary State of the Republic of Indonesia (Indonesian: Undang-Undang Dasar Negara Kesatuan Republik Indonesia Tahun 1945, lit. 'Basic Law of State of the Republic of Indonesia Year 1945', commonly abbreviated as UUD 1945 or UUD '45) is the supreme law and basis for all laws of Indonesia.
The constitution was written in June–August 1945, in the final months of the Japanese occupation of the Dutch East Indies at the end of World War II. It was abrogated by the Federal Constitution of 1949 and the Provisional Constitution of 1950, but restored by President Sukarno's 1959 Decree.