His Royal Highness Prince Purachatra Jayakara, Prince of Kamphaengphet (Thai: ?????????????; RTGS: Burachat Chaiyakon; 23 January 1881 – 14 September 1936) was a Prince of Siam and a member of the Siamese Royal Family (later Thailand).
He founded the House of Chatrajaya (??????????????), his descendants still use this royal surname.
He was a son of King Chulalongkorn (Rama V the Great) of Siam.
He was often called the Father of the Thai radio and the Father of the Thai railways, due to his contributions in both fields.