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

In House M.D., House’s closest friend and fellow physician is James Wilson.

Robert Sean Leonard plays Dr. James Wilson, an oncologist who works at Princeton-Plainsboro Teaching Hospital. Wilson is one of the few people willing to challenge House personally while still understanding his methods and temperament. Their friendship is a major relationship throughout the series.

Wilson’s specialty is oncology, the branch of medicine concerned with cancer. This gives the character a distinct professional role from House’s diagnostic work. Wilson also serves in several administrative positions at the hospital, including department leadership.

The name can be confused with actor Robert Sean Leonard, who plays Wilson, or with Wilson’s colleague Eric Foreman. “James Wilson” is the character’s name; “Robert Sean Leonard” is the actor’s name. Their friendship also loosely mirrors the Holmes–Watson relationship that influenced House’s design.