| Devan Udayawongse | |
|---|---|
| Prince Devawongse Varoprakar | |
 | |
| Minister of Foreign Affairs | |
| In office | 12 June 1885 – 28 June 1923 |
| Predecessor | Tuam Bunnag |
| Successor | Traidos Praband |
| Born | 27 November 1858 Bangkok, Siam |
| Died | 28 June 1923 (aged 64) Bangkok, Siam |
| Spouse |
|
| Issue | 48 sons and daughters |
| House | Devakula family (Chakri Dynasty) |
| Father | Mongkut (Rama IV) |
| Mother | Piam Sucharitakul |
Devan Udayawongse, the Prince Devawongse Varoprakar (Thai: สมเด็จพระเจ้าบรมวงศ์เธอ พระองค์เจ้าเทวัญอุไทยวงศ์ กรมพระยาเทวะวงศ์วโรปการ; 27 November 1858 – 28 June 1923) was a Siamese prince and diplomat during the reigns of Rama V and Rama VI.
Born as son of King Mongkut and Princess Consort Piam with the given name Prince Devan Udayawongse (เทวัญอุไทยวงศ์; RTGS: Thewan-u-thaiwong), he had the same parents as the three queens of King Chulalongkorn, Queen Sunandha Kumariratana, Queen Savang Vadhana and Queen Saovabha Bhongsi. Prince Devawongse Varoprakar was the 42nd child of King Mongkut's 82 children.
He is the founder of the House of Devakula (ราชสกุลเทวกุล) and was also known for naming the solar calendar months after the zodiac signs.