Urubongse Rajasombhoj
Prince Urubongs
Born	(1893-10-15)15 October 1893 Grand Palace Bangkok, Siam
Died	20 September 1909(1909-09-20) (aged 15) Bangkok, Siam
House	Chakri Dynasty
Father	Chulalongkorn (Rama V)
Mother	Luean Niyavananda

Urubongse Rajasombhoj (Thai: อุรุพงศ์รัชสมโภช; RTGS: Uruphong Ratchasomphot; 15 October 1893 – 20 September 1909) was Prince of Siam (later Thailand). He was a son of Chulalongkorn of Siam. His mother was The Noble Consort (Chao Chom Manda) Luean Niyavananda, daughter of Lord (Phra) Narindrabhorn and Prik Niyavananda. His elder full sister, Princess Lavad Voraong, died in infancy.

As a child he joined his father on trips to many places, including Europe. Unlike the other princes, Urubongse was not educated in Europe, but instead received instruction from foreign teachers at a private residence in Siam.

He died on 20 September 1909, on King Chulalongkorn's birthday, at the age of 15. His death brought sadness to the members of the Royal Family, especially King Chulalongkorn. The king ordered the building of a bridge in the city with sculptures of Prince Urubongse set into both sides. King Chulalongkorn named the bridge after his son; Uruphong Bridge, where Uruphong Avenue crossed. This bridge was eventually demolished but Uruphong Road and Uruphong Intersection remain today.

v t e Thai princes
The generations are numbered from the establishment of the Chakri dynasty from 1782
Rama I	Sons Chim** ()* Chui** Arunothai** Wasukri Grandsons Pavares Variyalongkorn Brothers Bunma** Nephews Thong-In*** Tan
Rama II	Sons Mongkut ()* Chutamani** Thap ()* Nuam Grandsons Yodyingyot** Great-grandsons Rajani Chamcharas Great-great-grandsons Bhisadej Rajani
Rama III	Grandsons Prisdang
Rama IV	Sons Somanass Chulalongkorn ()* Chaturonrasmi Bhanurangsi Savangwongse Chit Charoen Kasemsan Sophak Manusyanaga Manob Daksinavat Nares Varariddhi Gagananga Yukala Kashemsri Subhayok Srisiddhi Thongjaya Unakan Ananta Norajaya Devan Udayavongse Svasti Sobhana Worawannakon Tisavarakumarn Jayanta Mongkol Grandsons Birabongse Bhanudej Suphayok Kasem Devawongse Varodaya Wan Waithayakon Vodhyakara Varavarn Nandiyavat Svastivatana Vivadhanajaya Boworadet Dhani Nivat Great-grandsons Sithiporn Kridakara
Rama V	Sons Vajiravudh ()^ ()* Tribejrutama Dhamrong Chakrabongse Bhuvanath Siriraj Kakudhabhand Asdang Dejavudh Chudadhuj Dharadilok Prajadhipok Sakdidej ()* Vajirunhis ()^ Sommatiwongse Varodaya Mahidol Adulyadej Paribatra Sukhumbandhu Yugala Dighambara Isaravongs Vorarajakumara Raphi Phatthanasak Benbadhanabongse Kitiyakara Voralaksana Chirapravati Voradej Vudhijaya Chalermlabha Abhakara Kiartivongse Purachatra Jayakara Rangsit Prayurasakdi Samaya Vudhirodom Khajera Chirapradidha Isariyabhorn Anusara Siriprasadh Urubongs Rajsombhoj Grandsons Chula Chakrabongse Varananda Dhavaj Ananda Mahidol ()* Bhumibol Adulyadej ()* Chumbhotbongs Paribatra Sukhumabhinanda Bhanubandhu Yugala Anusorn Mongkolkarn Nakkhatra Mangala Aditya Dibabha Prem Purachatra Great-grandsons Chatrichalerm Yukol
Rama VI	No Son
Rama VII	No Children
Rama VIII	No Children
Rama IX	Son Vajiralongkorn ()^ ()*
Rama X	Sons Dipangkorn Rasmijoti Juthavachara VivacharawongseX Vacharaesorn VivacharawongseX Chakriwat VivacharawongseX Vatchrawee VivacharawongseX
()* Became king ** Appointed Viceroy *** Appointed Deputy Viceroy ()^ Appointed Crown Prince X was degraded from royalty