Iwanagahime-no-Mikoto is a deity from Japanese mythology, the elder daughter of the mountain god Oyamatsumi and sister of Konohanasakuya-hime. According to the Kojiki and Nihon Shoki, she was offered in marriage to the heavenly grandson Ninigi-no-Mikoto but was sent back in favor of her sister, an act said to have introduced mortality and impermanence to human life. She is associated in tradition with themes of enduring love, steadfastness, and the complexities of relationships, reflecting the narrative role she holds in these ancient texts.