Which House M.D. character is known by the number “Thirteen”?

Remy Hadley is the House M.D. character known by the nickname “Thirteen.”

Thirteen, played by Olivia Wilde, joins House’s diagnostic team after a competitive selection process. House frequently uses the nickname rather than her given name, creating an intentional mystery about her identity during her early appearances.

The character’s medical and personal storylines include her diagnosis with Huntington’s disease, an inherited neurodegenerative disorder. That diagnosis becomes a major source of conflict and vulnerability, especially because Thirteen must confront an uncertain future while continuing to treat patients.

“Thirteen” is not her surname and is not simply the name of the actress’s role in another series. The character’s full name is Remy Hadley. Olivia Wilde played Thirteen from the fourth season onward, with later appearances shaped by the character’s leave from and return to the hospital.