Prince Souvanna Phouma (7 October 1901 – 10 January 1984) was the leader of the neutralist faction and Prime Minister of the Kingdom of Laos several times from 1951–1954, 1956–1958, 1960 and 1962–1975.
He was the son of Bounkhong, the last vice-king of Luang Prabang and a nephew of King Sisavang Vong of Laos, given a French education in Hanoi, Paris and Grenoble, where he obtained his degree in architecture and engineering.
In 1951, Souvanna became Prime Minister of Laos under the National Progressive Party banner with a landslide victory, winning 15 of the 39 seats in the National Assembly. He was prime minister until 1954. After elections in December 1955, Souvanna Phouma returned to the prime ministership on a platform of national reconciliation. In June 1958 Souvanna was again forced to resign by the rightists. The king accepted the vote as legal the next day when he signed Royal Ordinance No. 282, dismissing Souvanna Phouma's government and giving powers provisionally to the Revolutionary Committee. Royal Ordinance No. 283, approved a provisional government formed by Prince Boun Oum, who acted as front man for Phoui Sananikone. He was one of the Three Princes, whom Sisavang Vatthana appointed to form a coalition government between the rightists and Pathet Lao but it collapsed, and the Laotian Civil War began.