In House M.D., what is the name of Dr. House’s closest friend and fellow doctor?

James Wilson is Dr. House’s closest friend in House M.D.

Dr. Wilson is an oncologist and the head of the oncology department at Princeton-Plainsboro Teaching Hospital, the fictional institution where much of the series takes place. His empathy and social awareness contrast with House’s abrasive investigative style.

Robert Sean Leonard portrayed Wilson throughout the series. Wilson often serves as House’s confidant, moral counterweight, and interpreter when House’s behavior damages his relationships with patients or colleagues.

The friendship is central to the show’s later storylines, including Wilson’s cancer diagnosis in the final season. Viewers sometimes confuse Wilson’s specialty with diagnostic medicine, but oncology— the study and treatment of cancer—is the clearly established field associated with him.