Princess Arunvadi (; 13 June 1857 - 26 August 1933) was a princess of Siam (later Thailand). She was a member of the Siamese royal family and a daughter of King Mongkut of Siam and Chao Chom Manda Run.
Her mother was Chao Chom Manda Run Supanimitr (a daughter of Kratai Supanimitr and Cham Supanimitr). She was given the full name Phra Chao Borom Wong Ther Phra Ong Chao Arunvadi ().
She died on August 26, 1933, at the age of 76.