Sandra Oh (born July 20, 1971) is an award-winning Canadian actress, best known for playing Dr. Cristina Yang in the ABC series Grey's Anatomy and her roles in feature films. In 2005, Oh made People Magazine's list of the 50 Most Beautiful People.

Oh was born to Korean immigrant parents in the Ottawa suburb of Nepean, Ontario, where she attended Sir Robert Borden High School and founded the Enviromental Club there. She became a ballet dancer and later became interested in acting while in high school, where she took drama classes, acted in school plays, and was a member of the drama club. Oh eventually studied drama at the National Theatre School in Montreal, whereafter she starred in a London, Ontario stage production of David Mamet's Oleanna. Around the same time, she also appeared as the title character in the Canadian television film, The Diary of Evelyn Lau, and won the role over more than a 1,000 others who auditioned.

Oh is known in Canada for her lead performances in the Canadian film Double Happiness, for which she won the Genie Award for Best Actress. Her other Canadian films include Long Life, Happiness and Prosperity, and Last Night, which she again won a Best Actress Genie for. Oh also won FIPA d'Or Best Actress at Cannes Film Festival for her role in The Diary of Evelyn Lau.

Oh is most familiar to American audiences from her roles in the popular films Under the Tuscan Sun and Sideways. On American television, she is renowned for her current role in the hit ABC medical series Grey's Anatomy, for which she has won both a 2006 Golden Globe Award for Best Supporting Actress in a Series and a 2005 Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Drama Series. She had also made several guest appearances on the series Popular (1999) playing a humanties teacher.

In theatre, Oh has also starred in the world premieres of Jessica Hagedorn's Dogeaters at the La Jolla Playhouse and Diana Son's Stop Kiss at Joseph Papp's Public Theatre in New York.

In 2006, she will be featured in the film The Night Listener as "Anna," alongside Robin Williams and Toni Collette. Although Oh remains active in feature film, the critically acclaimed Grey's Anatomy remains her primary, current occupation.

Oh and American filmmaker Alexander Payne were in a relationship for five years, including two years of marriage. In March 2005, the couple's spokesperson announced their separation. A month later, Oh filed for divorce.

Selected filmography:
3 Needles (2005) ... as Mary
Cake (2005) ... as Lulu
Grey's Anatomy (TV series) (2005-present) ... as Dr. Cristina Yang
Hard Candy (2005) ... as Judy Tokuda
Mulan II (2004) ... voice of Ting Ting
Sideways (2004) ... as Stephanie
Rick (2003) ... as Michelle
Under the Tuscan Sun (2003) ... as Patti
Long Life, Happiness & Prosperity (2002) ... as Kim Ho Lum
Big Fat Liar (2002) ... as Mrs. Phyllis Caldwell
The Princess Diaries (2001) ... as Vice Principal Gupta
Dancing at the Blue Iguana (2000) ... as Jasmine
Popular (TV series) (1999)... as a humanities teacher
The Red Violin (1998) ... as Madame Ming
Last Night (1998) ... as Sandra
Bean (1997) ... as Bernice Schimmel
Arli$$ (TV series) (1996) ... as Rita Wu
Double Happiness (1994) ... as Jade Li
She has also guest starred in the television series Kung Fu: The Legend Continues, Judging Amy, and Six Feet Under.