Kaysone Phomvihane () (13 December 1920 – 21 November 1992) was a Laotian politician. He was the first leader of the Lao People's Revolutionary Party from 1955 until his death in 1992. He was the first Prime Minister of the Lao People's Democratic Republic from 1975 to 1991 and then as the second President from 1991 to 1992.