Stacy London is an American fashion consultant and media personality, known best for her role as a co-host on the makeover reality program What Not to Wear which broadcasts on TLC in the United States and Canada.

London was born to Jewish-American parents in New York City on May 25, 1969. She received her A.B. from Vassar College with a double major in Philosophy and Germanic Studies, graduating Phi Beta Kappa. She began working in the fashion industry as a fashion assistant at Vogue magazine and later returned to Conde Nast as the senior fashion editor at Mademoiselle. She has styled fashion photos for other editorial publications, including Italian D, Nylon and Contents.

London has worked with a number of celebrities including Kate Winslet and Liv Tyler, as well as on fashion shows for designers such as Rebecca Taylor, Ghost, and Vivienne Tam.

Since 2003, Stacy has worked on numerous advertising campaigns. Her client roster includes Hanes, Wonderbra, Bali, Procter & Gamble, Covergirl, Suave, Target, Levi Strauss & Co., Maytag, Swatch USA, Longines and Calvin Klein. She can also be seen in recent Macy's commercials.

Stacy London co-hosts "What Not to Wear" with Clinton Kelly. She is known for her wit, as well as the trademark grey streak in her hair. She also has a love for high-heeled shoes. In a "Best of 2005" lookback show, Clinton Kelly teased London by saying "....there are almost as many great moments as there are high heels in Stacy's wardrobe." Stacy is more aggressive than her male co-host, and will bluntly criticize guests for their fashion mishaps. In September 2005, London and Kelly co-wrote a book entitled Dress Your Best: The Complete Guide to Finding the Style That's Right for Your Body.

London appeared on Oprah's "Jean Intervention" episode in November 2005.