Thongsing Thammavong (Lao: ທອງສິງ ທຳມະວົງ; born 12 April 1944) is a Laotian politician who was the Prime Minister of Laos from 2010 to 2016. He is a member of the Lao People's Revolutionary Party (LPRP) and has been a member of the LPRP Politburo since 1991. He currently serves in the National Assembly of Laos, representing Luang Prabang Province (Constituency 6), and was the President of the National Assembly from 2006 to 2010. He became Prime Minister on 23 December 2010, and left office on 20 April 2016.