Kingdom of Siam

Kingdom of Siam may refer to:
 * Sukhothai Kingdom (1238–1351)
 * Ayutthaya Kingdom (1351–1767)
 * Thonburi Kingdom (1768–1782)
 * Rattanakosin Kingdom (1782–1932)
 * Thailand before 24 June 1939 and again from 8 September 1945 to 20 July 1949