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.