Ajrabarni Rajkanya

 Princess Ajrabarni Rajkanya or Phra Chao Boromwongse Ther Phra Ong Chao Ajrabarni Rajkanya (RTGS: Atcharaphanni Ratchakanya) (พระเจ้าบรมวงศ์เธอ พระองค์เจ้าอัจฉรพรรณีรัชกัญญา) (7 July 1872 – 15 November 1910), was the Princess of Siam (later Thailand). She was a member of Siamese royal family. She was a daughter of Chulalongkorn, King Rama V of Siam.

Her mother was Chao Chom Manda Talab Ketutat, daughter of Phraya Viangnai Narubal. She had a younger brother, Prince Raphi Phatthanasak, the Prince of Ratchaburi, who is known as Father of the Thai Law.

Princess Ajrabarni Rajkanya died on 15 November 1910, a month after her father's death, at the age of 38.

Honours

 * Order of Chula Chom Klao - 2nd Class upper (Thailand) ribbon.svg Dame Grand Commander (Second Class, upper grade) of the Most Illustrious Order of Chula Chom Klao (1899)
 * King Rama V Royal Cypher Medal (Thailand) ribbon.svg King Rama V Royal Cypher Medal, 2nd Class (1908)