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Theodore Raymond Knight (b. March 26, 1973) is an American actor, perhaps best known for his current role as Dr. George O'Malley on ABC's top-rated drama Grey's Anatomy.

Knight was born in Minneapolis, Minnesota, where he became involved with the Guthrie Theater at the age of five. After finishing high school, Knight enrolled at the University of St. Thomas in St. Paul, Minnesota for a brief period of time. He dropped out and soon landed leading roles at the Guthrie Theater.

Knight moved to New York City and has appeared on Broadway; his most notable role was playing opposite Patti LuPone in the 2001 revival of Noises Off. Knight's most recent stage appearance was in the 2004 drama, Boy. He also gained notice performing in 2003 as Damis in Tartuffe and received a Drama Desk Award nomination in 2003 for his role in the off-Broadway production of Scattergood. On television, Knight was a regular cast member of the short-lived Nathan Lane series, Charlie Lawrence, with Laurie Metcalf. In 2005, he was cast as the sweet, bumbling intern George O'Malley on the ABC medical drama Grey's Anatomy. It is rumoured that along with Kate Walsh, who is set to star in her own show, Knight is to be leaving Grey's Anatomy saying he never got over the incident with Isaiah Washington, who plays Preston Burke on the show.