Purachatra Jayakara, Prince of Kamphaengphet (Thai: บุรฉัตรไชยากร; 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 (ราชสกุลฉัตรไชย), 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.