The Presidential Decree of 5 July 1959 (legally the Decree of the President of the Republic of Indonesia Number 150 of 1959 on the Return to the Constitution of 1945, Indonesian: Keputusan Presiden Republik Indonesia Nomor 150 Tahun 1959 Tentang Kembali kepada Undang-Undang Dasar 1945) 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).

The decree, which was read by Sukarno at the Merdeka Palace reads as follows: DECREE OF THE PRESIDENT OF THE REPUBLIC OF INDONESIAAND COMMANDER-IN-CHIEF OF THE NATIONAL ARMED FORCESOn the official reintroduction of the 1945 State Constitution of the Republic of Indonesia With the Mercy of Almighty God

Resolve thus to order the dissolution of the Constituent Assembly, Resolve that the 1945 Constitution is once again in force for the entire Indonesian people and the entire Indonesian nation, as from the date of the enactment of this decree and that the Provisional Constitution is no longer in force within the Republic, Resolve to order the establishment of a Provisional People's Consultative Assembly, which is made up of the members of the House of Representatives with the delegates from the regions and groups, with the establishment of a Provisional Supreme Advisory Council to be organized as speedily as possible, in keeping with the provisions of the aforementioned Constitution.

Resolved in Jakarta on July 5th, 1959 In the name of the People of Indonesia: President of the Republic of Indonesia/Commander in Chief of the National Armed Forces