Prince Purachatra Jayakara, the 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.

Prince Purachatra Jayakara was born on 23 January 1881 in the compound of the Grand Palace. He was the 35th son of Chulalongkorn and Consort Wat. He received the education in Suankularb Wittayalai School. In 1894, he attended Harrow School, England. Then attended School of Engineering at Trinity College, University of Cambridge, and engineering at Chatham. And he attended studying in France and Netherlands in the School of engineering of digging dam-canals. After graduating, he went back to work in England. He became the officer of the Institution of Civil engineer.

He came back to Thailand in 1904. He worked as the military engineer, and officer of the Siamese Royal Army. He had served for 17 years. He developed the Siamese Department of Engineering militaries in his knowledge he got from the western. Later he retired himself and moved to Singapore with his family in 1933. He resided there until his death on 14 September 1936, at the age of 55.

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