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| Sisavangvong | |
|---|---|
| Rey De Laos | |
 | |
| King of Laos | |
| Reign | 23 April 1946 – 29 October 1959 |
| Predecessor | Position created |
| Successor | Sisavang Vatthana |
| King of Luang Prabang | |
| Reign | 28 April 1904 – 20 October 1945 |
| Coronation | 4 March 1905 |
| Predecessor | Zakarine |
| Successor | As King of Laos |
| Born | 14 July 1885 Luang Prabang, Kingdom of Luang Prabang |
| Died | 29 October 1959 (aged 74) Luang Prabang, Laos |
| Spouses | Princess Kham-Oun I Princess Khamphane Princess Khamla Princess Khamboua Princess Khamtip Princess Khamtouane Princess Kamaduni Princess Indrakama Princess Kamuni Princess Chansy |
| Issue | Sisavang Vatthana |
| House | Khun Lo |
| Father | Zakarine |
| Mother | Thongsy |
King Sisavangvong (Lao: ພຣະບາທສົມເດັຈພຣະເຈົ້າມະຫາຊີວິຕສີສວ່າງວົງສ໌; born Prince Khao (ຂາວ) 14 July 1885 – 29 October 1959), known by his courtesy name Sisavangvong, was the last ruler of the Lao Kingdom of Luang Prabang and the founding king of the Kingdom of Laos. Born Prince Khao on 14 July 1885, he ascended the throne at the age of 18 following the death of his father. In keeping with Lao tradition, he took the courtesy name Sisavangvong.
Born in the Golden Palace of Luang Prabang during his father's reign under French colonial authority, Prince Khao extended his rule over other Lao kingdoms and built a new royal palace during his reign over Luang Prabang. He briefly ruled as king of the Japanese puppet state of Luang Prabang in late 1945, but was dethroned by the Lao Issara for his pro-French stance. He was later reinstated as monarch by the French in 1946, marking the first time in almost 250 years that a Lao monarch ruled the whole of Laos.