Calliope Iphegenia Torres, M.D. is a fictional character from the medical drama television series Grey's Anatomy, which airs on the ABC in the United States. The character was created by series' producer Shonda Rhimes, and is portrayed by Sara Ramirez. She was introduced in season 2, as a senior orthopedic resident, as a love-interest for intern George O'Malley. Eventually becoming an attending orthopedic surgeon, the character was originally contracted to appear on a recurring basis, but received star-billing in season 3.

Grey's Anatomy is an American medical drama television series focusing on the personal and professional lives of surgical interns, residents, and attendings at the fictional Seattle Grace Hospital, later named the Grey Sloan Memorial Hospital. The series premiered on March 27, 2005, on ABC as a mid-season replacement. The show's title is an allusion to Gray's Anatomy, a classic human anatomy textbook. Writer Shonda Rhimes developed the pilot and served as showrunner, head writer, and executive producer until stepping down in 2015. Set in Seattle, Washington, the series is filmed primarily in Los Angeles, California, and Vancouver, British Columbia.