| Consort: | yes |
| Succession: | Queen consort of Siam |
| Reign: | 2 April 1851 – |
| Birth Name: | Princess Somanass |
| Birth Date: | 21 December 1834 |
| Birth Place: | Bangkok, Siam |
| Death Place: | Bangkok, Siam |
| Spouse: | Mongkut (Rama IV) |
| Issue: | Prince Somanass |
| Posthumous Name: | Somdet Phra Nang Chao Somanass Waddhanawathy |
| House: | Chakri dynasty |
| Father: | Prince Lakkhananukhun |
| Mother: | Ngiu Suvarnadat |
| Religion: | Theravada Buddhism |
Somanass Waddhanawathy[1] [2] [3] (Thai: โสมนัสวัฒนาวดี; in Thai pronounced as /sǒː.má(ʔ).nát.wát.tʰà(ʔ).nāː.wá(ʔ).diː/; ; 1834–1852) Her full title is Her Majesty Queen Somanass Waddhanawathy was the first consort of Mongkut, the King of Siam, and the queen consort, though for only nine months.
Princess Somanass was a daughter of Prince Lakkhananukhun (son of Nangklao) and Ngiu Suvarnadat. Since her father, as a son of the king and of a royal concubine, was Phra Ong Chao (second-rank prince), Somanass was destined to be Mom Chao (third-rank princess). However, King Nangklao (Rama III) who was her grandfather, specially granted her the title of Phra Ong Chao (second-rank princess).
In 1851, upon his coronation, Mongkut married Princess Somanass, making her the queen. In 1852, she gave birth to a prince, Somdet Chaofa Somanass, but he died shortly after he was born, Queen Somanass herself died two months later.
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