Samsenethai (Lao: ສາມແສນໄທ) also called Oun Huan (Lao: ອຸ່ນເຮືອນ) was the second king of Lan Xang in Laos. He succeeded his father, Fa Ngum.^{[citation needed]}

He ruled from 1372 until 1417.

Wat Manorom, Wat Oubôsôt, and Wat Xiang Kham were built in Samsenethai's reign. He was succeeded by his son Lan Kham Deng.

• Father: Fa Ngum
• Mother: Queen Keo Kang Ya - (from Khmer Empire) (d. 1368)
• Consorts and their respective issues:

1. Queen Buvana Dhanipaya (Bua Then Fa), Princess Keava Nawi Anungahaya - a daughter of his uncle (m.1377)
   1. Prince Lamakamadinga Lan Kham Deng, King of Lan Xang (r.1416-1428)
2. Nang Nawiangsari (Noi On Sor) - daughter of the King of Lan Na
   1. Prince Gunikama (Konekham) (Khon Kham) - King of Lan Xang (r.1430–1432)
3. Queen Keava Rudhi Fa (Nang Keo Lot Fa) - his cousin, widow of his father, and daughter of King Ramadipati of Ayudhaya (m.1393)
4. Princess Nang Keava Sridha (Chao Nang Keo Sida) - daughter of Chao Sidhakama (Sida Kham), "Hsenwifa" of Muang Lü (Chieng Hung)
   1. Prince Kama Dharmasara (Kham Tam Sa) - King of Lan Xang (r.1432)
5. Princess Nang Keava Yudhi Fa (Nang Keo Yot Fa) - his cousin, and a daughter of King Intharacha of Ayutthaya
   1. Prince Wangsapuri (Vong Buri), (Sai Tia Kaphut), King of Lan Xang (r.1442-1480)
   2. Princess Mahakani (Maha Kay) - died before 1408, aged five.
6. a slave
   1. Kham Keul or Kham-Kert - King of Lan Xang (1436-1438)
7. by unknown women
   1. Prince Luvanajaya (Thao Lue-Sai), King of Lan Xang, r.1432-1433
   2. Thao Somphon
   3. Princess Anusha (Anocha).
   4. Princess Manura (Manora).
   5. Princess Supadhatri (Supatthat).