Remy Hadley was the physician known by the nickname Thirteen in House M.D.
Hadley joined House's diagnostic team during the fourth season after a competitive selection process. The nickname referred to her position in the applicant lineup rather than her real name. Her character became notable for her guarded personality, medical skill, and diagnosis of Huntington's disease.
Olivia Wilde played Hadley throughout the character's major appearances. Fans sometimes use “Thirteen” as though it were the character's legal name, but Remy Hadley is her given name. Other doctors on House's teams, including Amber Volakis and Martha Masters, are separate characters and should not be treated as alternate names for Thirteen.