Rebecca De Mornay (born Rebecca Jane Pearch on August 29, 1959) is an American film and television actress. Her breakout film role came in 1983, when she played Lana in Risky Business.

De Mornay was born in Santa Rosa, California. Her grandmother was child actress Eugenia Clinchard and her father was the conservative radio and television commentator Wally George (born George Walter Pearch). De Mornay was raised by her mother, Julie (née Eagar), and stepfather Richard De Mornay (he died when she was 5). As a child her name was changed from Pearch to DeMornay. She has one older half brother Jonathan De Mornay. She grew up in France, England, and Austria. She went to the progressive Summerhill School in England and earned her high school degree summa cum laude from German-speaking St. Johann in Tirol in the Austrian Alps. From this she is fluent in German and French. DeMornay has many half sisters and half brothers she has never met.

De Mornay lived with Tom Cruise for two and a half years after they met in Risky Business. In 1989 she married and divorced novelist/screenwriter Bruce Wagner in one year. In the early 1990s she was linked romantically to Leonard Cohen; some reports say they were engaged. She is credited as a producer and arranger on his album The Future (1992).