In House M.D., what was Dr. Robert Chase's nationality?

Dr. Robert Chase is Australian in House M.D.

Jesse Spencer plays Chase, one of the original members of House’s diagnostic team. The character’s Australian background is part of his identity and distinguishes him from several American colleagues at Princeton-Plainsboro Teaching Hospital. Chase is a physician whose medical interests and responsibilities develop substantially over the course of the series.

Chase initially works under House and often appears more compliant than Foreman or Cameron, but that apparent obedience does not mean he lacks independent judgment. His relationships, career choices, and eventual professional growth become recurring parts of the drama.

The character’s nationality is sometimes confused with the actor’s identity in a different way: Spencer is also Australian, having been born in Melbourne. That real-life connection makes Chase’s accent and background consistent, while many other cast members played characters whose nationalities differed from their own.