Calliope Iphegenia "Callie" Torres, portrayed by Sara Ramirez, is a fictional character from the medical drama television series Grey's Anatomy, which airs on ABC in the United States. She was introduced in season two as a senior orthopedic resident and love interest for intern George O'Malley (T.R. Knight). Eventually becoming an attending orthopedic surgeon, she received star billing in the third season.

Torres was initially conceived as a love interest and eventual wife for O'Malley, and was created to be disliked by her colleagues. After her marriage with O'Malley falls apart, she starts a relationship with Erica Hahn. The relationship begins when Erica jokingly kisses Callie to make Sloan jealous. This is the first relationship that either had had with another woman. 

Over the next seasons, Torres has relationships with men and women and proudly owns her bisexuality, marrying pediatric surgeon Arizona Robbins. She is the longest-running LGBTI character in television history, appearing in 11 seasons and 239 episodes.