Oto-hime or Otohime (), in the Japanese folktale of Urashima Tarà Â, is the princess of the undersea palace Ryà «gà «-jà Â.
Oto-hime (Princess Oto)'s name consists of the character also read otsu meaning "No. 2". Thus Oto-hime must have been the 'second daughter' or 'younger princess' of the Dragon King (Ryà «-à Â), as explained by folklorist in his bilingual edition of the In Urashima fairytale. Miyao whimsically wonders whatever became of Kà Â-hime, the elder daughter never mentioned.