The Constitutional Assembly was a body elected in 1955 to draw up a permanent constitution for the Republic of Indonesia. It sat between 10 November 1956 and 2 July 1959. It was dissolved by then President Sukarno in a decree issued on 5 July 1959 which reimposed the 1945 Constitution.

The Presidential Decree of 5 July 1959 was issued by President Sukarno in the face of the inability of the Constitutional Assembly of Indonesia to achieve the two-thirds majority to reimpose the 1945 Constitution. It was army chief of staff Abdul Haris Nasution who concluded that this would be the only way to bring about the reintroduction of a constitution that paved the way for the military to play a greater role in the running of the state, ushering in the period known as the "guided democracy" (1959–1966).