| Chudadhuj Dharadilok | |
| Prince of Phetchabun | |
| Spouse: | Bunchiradhorn Jumbala Ravi Kayananda La-or Sirisambandh |
| Issue: | Princess Sudasiri Sobha Prince Varananda Dhavaj |
| Birth Date: | 4 July 1892 |
| Birth Place: | Sichang Island, Siam |
| Death Place: | Bangkok, Siam |
Prince Chudadhuj Dharadilok, Prince of Phetchabun (Thai: จุฑาธุชธราดิลก;), (4 July 1892– 8 July 1923) was a son of King Chulalongkorn and Queen Saovabha of Thailand. He was one of the most senior Thai princes during the rule of his full brother, King Vajiravudh.
Prince Chudadhuj was born on 5 July 1892 at Morakut Sutta Palace, Ko Sichang, Chonburi province in which the King gave the name of the royal court Phra Chuthathut Palace according to the name "Prince Chudadhuj" who was born at that place. When he was young, he was named "Thun Kramom Tew". King Chulalongkorn please Prince Chudadhuj went to study in England along with Prince Asdang Dejavudh and Prince Mahidol Adulyadej. In 1905 he studied at Magdalene College, University of Cambridge and then he returned to government service as a professor at Chulalongkorn University, He taught English at Faculty of Political Science on 4 October 1918, and was the commander of Poh-Chang Academy of Arts in 1918.
Prince Chudadhuj's passion for art and played the grand piano, harp, and violin, theater arts and has written an ancient drama.
Prince Chudadhuj died at Sa Pathum Palace on 8 July 1923 at 31 years old.
Prince Chudadhuj married Princess Bunchiradhorn Jumbala (Thai: บุญจิราธร ชุมพล;) - however, he did not produce a child with her.
He had two illegitimate children with commoners, who nevertheless received the royal rank of Phra Worawong Ther Phra Ong Chao (Thai: พระวรวงศ์เธอ พระองค์เจ้า) :