| Phoun Sipaseuth | |
| Native Name Lang: | lo |
| Order1: | Deputy Prime Minister of Laos |
| Primeminister1: | Kaysone Phomvihane Khamtai Siphandon |
| Term Start1: | 2 December 1975 |
| Term End1: | 25 February 1993 |
| Alongside1: | Nouhak Phoumsavan, Phoumi Vongvichit and Khamtai Siphandon |
| Order2: | Minister of Foreign Affairs |
| Primeminister2: | Kaysone Phomvihane |
| Term Start2: | 2 December 1975 |
| Term End2: | 25 February 1993 |
| Predecessor2: | Phoumi Vongvichit (Royal Lao Government) |
| Successor2: | Somsavat Lengsavad |
| Birth Date: | 16 February 1920 |
| Death Place: | Vientiane, Laos |
| Occupation: | Politician |
| Party: | Lao People's Revolutionary Party |
| Nationality: | Laotian |
Phoun Sipaseuth (Lao: ພູນ ສີປະເສີດ; 16 February 1920 – 8 December 1994) was a Laotian politician and member of the Lao People's Revolutionary Party (LPRP). He served as Deputy Chairman of the Council of Ministers and Ministers of Foreign Affairs during the 1980s.
He was elected to the LPP Central Committee at the 1st National Congress and retained his seat until the 5th National Congress. At the 3rd National Congress he was elected to the LPRP Politburo.
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