Dr. House’s friend Wilson is named James Wilson in House M.D.
James Wilson is an oncologist and the head of oncology at Princeton-Plainsboro Teaching Hospital. He is portrayed by Robert Sean Leonard and serves as Gregory House’s closest long-term friend and most consistent personal counterbalance.
The character’s first name is easy to overlook because House and other characters usually call him “Wilson.” His full name appears in character references and in the series’ broader story, where his professional role and private life receive increasing attention.
Wilson’s importance grows as the show progresses. He often challenges House’s decisions, but he also understands House more deeply than most colleagues do. In the final season, Wilson’s diagnosis of thymoma changes the direction of both men’s lives and leads directly to the emotional stakes of the series finale.