The Kingdom of Luang Prabang (Lao: ອານາຈັກຫຼວງພະບາງ; Japanese: ルアンプラバン王国) was a short-lived puppet state of Imperial Japan, which existed from 8 April 1945 to 12 October 1945.

[2] Around October 1940 Thailand, sensing French weakness from the year's previous events, began attacking the eastern banks of the Mekong between Vientiane and Champassak provinces.

[4] Savang Vatthana and Resident-Superior Maurice Roques signed an agreement on 21 August 1941 which attached the provinces of Xiangkhouang and Vientiane to the Kingdom of Luang Prabang, and placed the protectorate on the same footing as Cambodia and Annam.

[5] In 1944, the Liberation of Paris under General Charles de Gaulle occurred, and at the same time, Imperial Japanese troops were being largely defeated in the Pacific Front.

The staunchly pro-French King Sisavang Vong was also imprisoned, and was forced by both the Japanese and Prince Phetsarath, into declaring the French protectorate over his kingdom ended, while entering the nation into the Greater East Asia Co-Prosperity Sphere on 8 April 1945.

Phetsarath also proclaimed unification with the country and the southern Lao provinces of Indochina on 15 September, this led to the King dismissing him from his post as Prime Minister on 10 October.