The Supreme Council of State of Siam (Thai: อภิรัฐมนตรีสภา) was an advisory and legislative council established by His Majesty King Prajadhipok of Siam (Rama VII) that existed from 1925 to 1932. The Eton and Sandhurst educated monarch wished to create a council similar to a cabinet, where the most important government officials could meet to decide on state affairs. The Council was founded on 28 November 1925 by Royal Command. Prajadhipok only succeeded to the throne three days earlier, after the death of his brother Vajiravudh on 25 November 1925.