Which fictional doctor in House M.D. specializes in oncology?

James Wilson is the fictional doctor in House M.D. who specializes in oncology.

Wilson serves as the head of the Department of Oncology at Princeton-Plainsboro Teaching Hospital. His specialty places him in frequent contact with patients facing cancer, while his compassionate manner contrasts with House’s confrontational approach. Wilson is also House’s closest friend and often acts as a moral or emotional counterweight to him.

The character was played by Robert Sean Leonard. Wilson’s role is broader than that of a hospital colleague: he helps House navigate personal crises, challenges his decisions, and remains involved in several major storylines. Viewers sometimes confuse Wilson’s specialty with House’s diagnostic medicine or Foreman’s neurology, but oncology is Wilson’s defining medical field in the series.