| Manyabhadhorn | |
| Full Name: | Manyabhadhorn |
| House: | Chakri Dynasty |
| Mother: | Chan Suksathit |
| Birth Date: | 22 November 1854 |
| Birth Place: | Bangkok, Siam |
| Death Place: | Bangkok, Siam |
Princess Manyabhadhorn (Thai: มัณยาภาธร ; ; 22 September 1854- 26 October 1885) was a Princess of Siam (later Thailand. She was a member of Siamese royal family is a daughter of King Mongkut and Chao Chom Manda Chan and half-sister of King Chulalongkorn.
Her mother was Chao Chom Manda Chan Suksathit (is a daughter of Suk Suksathit). She was a given full name by her father as Phra Chao Borom Wong Ther Phra Ong Chao Manyabhadhorn(Thai: พระเจ้าบรมวงศ์เธอ พระองค์เจ้ามัณยาภาธร).
Princess Manyabhadhorn died 26 October 1885 at the age 30.