|Princess of Siam|
|Born||12 January 1892|
|Died||17 October 1972 (aged 80)|
|Father||Chulalongkorn (Rama V)|
Hemvadi (Thai: เหมวดี; RTGS: Hemwadi; 12 January 1892 – 17 October 1972), was the Princess of Siam (later Thailand). She was a member of Siamese Royal Family. She is a daughter of Chulalongkorn, King Rama V of Siam.
Her mother was The Noble Consort (Chao Chom Manda) Hem Amatayakul (daughter of Lord (Phraya) Dhammasarnniti Vichitbakdi). After she was born, she was given the name from her father as Mandhana Bhavadi (Thai: มัณฑนาภาวดี). Later her father changed her name shorter into Hemvadi, on 8 January 1899, while she was 6 years old.
She lived in the Grand Palace all the rest of her life, and died on 17 October 1972, at the age of 80.
- Dame of The Most Illustrious Order of the Royal House of Chakri: received 9 May 1950
- Dame Cross of the Most Illustrious Order of Chula Chom Klao (First class): received 2 May 1950
Chulalongkorn, King Rama V of Siam
Mongkut, King Rama IV of Siam
Buddha Loetla Nabhalai, King Rama II of Siam
Queen Sri Suriyendra
Prince Sirivongse, the Prince Matayabidaksa
Mom Noi Sirivongs na Ayudhya
Chao Chom Manda Ham Amatayakul
Lord (Phraya) Dhammasarnniti Vichitbakdi