Siam is the former name of Thailand, and is used to refer to the historical region of Central Thailand, usually including Southern Thailand. Siam or SIAM may also refer to: Places Siam, Ohio, an unincorporated community in the United States Siam area, area in the Pathum Wan district of Bangkok, Thailand Siam BTS Station, rail station which serves this area Rue de Siam or Siam Street, a street in Brest, France Historical kingdoms Sukhothai Kingdom (1238-1438), a kingdom in what is now north central Thailand that eventually merged with Ayutthaya Ayutthaya Kingdom (1350-1767), a Siamese kingdom centered on the city of Ayutthaya Thonburi Kingdom (1767-1782), a kingdom with its capital in Thonburi, which is now part of Bangkok Rattanakosin Kingdom (1782–1932), a kingdom in Thailand until the Siamese revolution SIAM Salón Internacional del Automóvil México, an annual auto show in Mexico City Service integration and management, an information technology management framework Society for Industrial and Applied Mathematics (SIAM), an academic society Other uses Siam (name), a surname and given name, including notable people with the name Siam (duo), a Colombian musical duo Siam (album), their debut album See also Siamese (disambiguation) Sjam (disambiguation) Syam (disambiguation) History of Thailand