The fairy tale character who lost a glass slipper is Cinderella. This beloved character is the protagonist of the classic folk tale, which has numerous adaptations across cultures. In the story, Cinderella endures hardships and mistreatment from her stepmother and stepsisters until a fairy godmother helps her attend a royal ball. At the ball, she captivates the prince, but as she rushes to leave before midnight, she loses her glass slipper. This slipper becomes the key to her identity, leading the prince on a quest to find her, ultimately resulting in their union and happiness.