| Saysomphone Phomvihane | |
| Native Name Lang: | lo |
| Order: | President of the National Assembly of Laos |
| Term Start: | 22 March 2021 |
| Predecessor: | Pany Yathotou |
| Office1: | Chairman of the Central Committee of the Lao Front for National Construction |
| Term Start1: | 2016 |
| Term End1: | 15 March 2021 |
| Predecessor1: | Phandoungchit Vongsa |
| Successor1: | Sinlavong Khoutphaitoun |
| Order2: | Minister of Finance |
| Primeminister2: | Khamtai Siphandon |
| Term Start2: | 1995 |
| Term End2: | 24 February 1998 |
| Predecessor2: | Khamsay Souphanouvong |
| Successor2: | Khamphoui Keoboualapha |
| Birth Date: | 14 December 1956 |
| Birth Place: | Houaphanh Province, Laos |
| Relatives: | Kaysone (father) Thongvin (mother) Santiphap (brother) Sanyahak (brother) Thongsavanh (brother) |
| Occupation: | Politician |
| Party: | Lao People's Revolutionary Party |
| Nationality: | Laotian |
Saysomphone Phomvihane (; born 14 December 1956) is a Laotian politician and member of the Lao People's Revolutionary Party (LPRP). He is the son of former LPRP General Secretary Kaysone Phomvihane and Thongvin Phomvihane. He served as Chairman of the Central Committee of the Lao Front for National Construction. He currently serves as President of the National Assembly.
He was elected to the LPRP Central Committee at the 5th National Congress, and to the LPRP Politburo at the 10th National Congress.
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