In House M.D., which doctor is played by Robert Sean Leonard?

In House M.D., Robert Sean Leonard plays Dr. James Wilson.

Wilson is an oncologist and one of Gregory House’s closest friends. His specialty places him near patients facing serious or terminal illness, while his personal loyalty gives House a trusted confidant who can challenge his decisions.

The friendship between Wilson and House is a central relationship in the series. Wilson often acts as House’s emotional counterweight: he is generally more empathetic and socially accommodating, but he also has personal limits and conflicts of his own. Their relationship survives repeated arguments, professional disputes, and major changes in their lives.

Robert Sean Leonard was already known for film and stage work before House M.D., including Dead Poets Society. The television role made Wilson one of the show’s most recognizable supporting characters and earned Leonard a Screen Actors Guild Award as part of the ensemble cast.