| Samsenthai | |
| King of Lan Xang | |
| Reign: | 1374–1416 |
| Coronation: | 1374 |
| Predecessor: | Fa Ngum |
| Successor: | Lan Kham Deng |
| Spouse: | Queen Keo Lot Fa (Ayutthaya) Queen Bua Then Fa (Muang Sua) Queen Noi On Sor (Lan Na) Queen Keo Yot Fa (Ayutthaya) Queen Keo Sida (Sip Song Panna) |
| Issue: | Prince Lusai Prince Lan Kham Deng Prince Kham Tam Sa Prince Khon Kham Prince Vang Buri Princess Keo Kumari Princess Anocha Princess Manora Princess Suphatthat Princess Mahakai |
| Dynasty: | Khun Lo |
| Father: | Fa Ngum |
| Mother: | Keo Kang Ya |
| Religion: | Therevada Buddhism |
| Birth Name: | Oun Heuan |
| Birth Date: | 1357 |
| Birth Place: | Muang Sua, Lan Xang |
| Death Date: | 1416 |
| Death Place: | Muang Sua, Lan Xang |
| Regnal Name: | Samdach Brhat-Anya Samu Sena Daya Daya Buvana Natha Adipati Sri Sadhana Kanayudha (Lao: ສົມເດັຈພຣະຍາ ສາມແສນໄທ ໄຕຣ໌ພູວະນາທອາທິປັຕ ສຼີສັຕນາຄະນາຫຸທ) |
Samsenethai (Lao: ສາມແສນໄທ) also called Oun Huan (Lao: ອຸ່ນເຮືອນ) was the second king of Lan Xang in Laos. He succeeded his father, Fa Ngum.
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.