Dr. House’s best friend in House M.D. is Dr. James Wilson.
Wilson is the head of oncology at Princeton-Plainsboro Teaching Hospital and is played by Robert Sean Leonard. He acts as House’s emotional counterweight: he understands House’s intelligence and humor but regularly challenges his selfishness, recklessness, and resistance to change.
The friendship is one of the show’s central relationships. Wilson often helps House interpret personal situations that House approaches as puzzles, while House repeatedly interferes in Wilson’s life despite claiming to value logic above sentiment. Their bond survives professional disputes, romantic complications, and House’s destructive behavior.
Wilson’s first name is James, not Robert. Robert is the actor’s first name, which can create confusion in short descriptions of the character. The character’s full name is James Evan Wilson, and his medical field is oncology, the study and treatment of cancer.