Princess Nibha Nobhadol, Princess of Uthong, or Somdet Phra Chao Boromwongse Ther Chao Fa Nibha Nobhadol Vimolprabhavadi Krommakhun Uthongkhet Khattiyanari (RTGS: Nipha Nopphadon; Thai: สมเด็จพระเจ้าบรมวงศ์เธอ เจ้าฟ้านิภานภดล วิมลประภาวดี กรมขุนอู่ทองเขตขัตติยนารี; 4 December 1886 – 29 January 1935), 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. She served as the personal secretary of her father, King Chulalongkorn, while he did many royal duties. He always wrote the letters while visiting Europe to her, which are all collected in her novel called Klai Baan or .