 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (July 2018) |
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 Portrait of Vajirunhis, 1922 | |
| Crown Prince of Siam | |
| Tenure | 14 January 1886 – 4 January 1895 |
| Appointer | Chulalongkorn (Rama V) |
| Predecessor | Position established (Wichaichan as Vice King) |
| Successor | Vajiravudh (later Rama VI) |
| Born | 27 June 1878 Bangkok, Siam |
| Died | 4 January 1895 (aged 16) Bangkok, Siam |
| House | Chakri dynasty |
| Father | Chulalongkorn (Rama V) |
| Mother | Savang Vadhana |
| Religion | Theravada Buddhism |
| Signature |  |
Maha Vajirunhis, Crown Prince of Siam (Thai: มหาวชิรุณหิศ; RTGS: Maha Wachirunnahit; 27 June 1878 – 4 January 1895) was the first Crown Prince of the Chakri dynasty. He was the first son of King Chulalongkorn and Queen Savang Vadhana together, who were half-siblings.
The King built a palace for the Prince, nicknamed Windsor Palace. The European-style palace was demolished after his death. The site is now occupied by the National Stadium of Thailand.