Sandra Miju Oh OC (born July 20, 1971) is a Canadian and American actress. She is known for her starring roles as Rita Wu in the HBO comedy series Arliss (1996–2002), Dr. Cristina Yang in the ABC medical drama series Grey's Anatomy (2005–2014), and Eve Polastri in the BBC America spy thriller series Killing Eve (2018–2022). She has received one Primetime Emmy Award from fourteen nominations, two Golden Globe Awards and four Screen Actors Guild Awards. In 2019, Time magazine named Oh one of the 100 most influential people in the world.

Oh first gained recognition for her roles in the Canadian films Double Happiness (1994) and The Diary of Evelyn Lau (1994), where she won Genie Awards for both films. Her later television credits include Judging Amy and American Crime, as well as voice roles on American Dad!, American Dragon: Jake Long, The Proud Family, Phineas and Ferb, Chop Socky Chooks, She-Ra and the Princesses of Power, and Invincible. In 2021, she played the lead role in the Netflix comedy-drama series The Chair. She was also one of the executive producers of the series.