| Chao Ong Long Lao: ເຈົ້າອົງລອງ | |
| King of Vientiane | |
| Succession: | King of Vientiane |
| Reign: | 1735–1760 |
| Full Name: | Samdach Brhat Chao Maha Sri Ungalankaya Chandapuri Sri Sadhana Kanayudha |
| Predecessor: | Sai Ong Hue |
| Successor: | Siribunnyasan |
| Birth Date: | ? |
| Birth Place: | Vientiane, Lan Xang |
| Death Date: | 1760 |
| Death Place: | Vientiane |
Chao Ong Long (also spelled Ong Lông; lo|ເຈົ້າອົງລອງ; died 1760) was the king of Vientiane from 1735 to 1760.[1]
Ong Long was the eldest son of Setthathirath II (Sai Ong Hue),[1] other source stated that he was a half-brother of Sai Ong Hue.[2] He succeeded Sai Ong Hue in 1730. Little is known about his reign. He died in 1760 or 1767, succeeded by his son[1] [2] (or younger brother) Siribunnyasan (Ong Boun).