Alessandra Corine Ambrósio (born April 11, 1981) is a Brazilian supermodel. Her last name is spelled Ambrósio, but the diacritic mark is omitted in her modeling work. She was described by retired supermodel Tyra Banks as "The future of the modeling world". She is best known for her work with Victoria’s Secret and was chosen as their first spokesmodel for Victoria's Secret PINK line. She is currently one of Victoria’s Secret Angels and the face for the UK company Next. Aside from modeling work, she represents as the National Ambassador for the National Multiple Sclerosis Society.

When Ambrosio was 12 years old, she enrolled in modeling classes then, began modeling for Dilson Stein at age 15. Winning Brazil's Elite Model Look started her modeling career. Her first big modeling job was the cover of the Brazilian Elle magazine. Elite passed along some of her Polaroids to Guess which led her to do the Millennium GUESS? campaign along with her friend and fellow Brazilian supermodel Ana Beatriz Barros. She has since been in huge demand, working with big-name brands including Revlon, Christian Dior, Giorgio Armani, Rolex, Oscar de la Renta, Gucci, Escada, Rocco Barocco, Calvin Klein and Ralph Lauren, as well as the famed Pirelli Calendar.[13][4] As for fashion shows, she has walked the catwalks for designers such as Laura Biagiotti, Christian Lacroix, Byblos, Fendi, Issey Miyake, Kenzo, Christian Dior, Nicole Miller, Ralph Lauren, Giorgio Armani, Vivienne Westwood, Oscar de la Renta, among others. She appeared in over 50 international magazine covers such as Cosmopolitan, ELLE, GQ, Harper's Bazaar, Marie Claire, Ocean Drive, Vogue and the only model to appear on the cover of Glamour in the USA in 2006.

In 2004, Ambrosio launched her line of swimwear called Alessandra Ambrosio by Sais, a division of Rosa Cha. It sold 10,000 units in only its first month on the market.