| Chao Nantharat | |
| King of Lan Xang | |
| Succession: | King of Lan Xang |
| Reign: | 1696–1698 |
| Full Name: | Samdach Brhat Chao Phya Nanda Raja Sri Sadhana Kanayudha |
| Predecessor: | Tian Thala |
| Successor: | Xai Ong Ve |
| Birth Date: | ? |
| Death Date: | 1698 |
| Death Place: | Vientiane |
Nan Tharat (died 1698) was a king of Lan Xang who ruled from 1696 to 1698.[1]
Nan Tharat, a cousin of Sourigna Vongsa,[1] served as the governor of Sikhottabong.[2] After the death of Sourigna Vongsa, Nan Tharat briefly usurped the throne from Tian Thala. However, he was overthrown by Xai Ong Ve in 1698[3] and executed.