Dame Anna Wintour, born 3 November 1949, is a British-American journalist and editor who has been editor-in-chief of Vogue since 1988 and artistic director for Condé Nast, Vogue's publisher, since 2013. With her trademark pageboy bob haircut and dark sunglasses, Wintour has become an important figure in much of the fashion world, widely praised for her eye for fashion trends and her support for younger designers. Her reportedly aloof and demanding personality has earned her the nickname "Nuclear Wintour". Her father, Charles Wintour, editor of the London Evening Standard (1959–1976), consulted her on how to make the newspaper relevant to the youth of the era. She became interested in fashion as a teenager. Her career in fashion journalism began at two British magazines. Later, she moved to the US, with stints at New York and House & Garden. She returned to London and was the editor of British Vogue between 1985 and 1987. A year later, she assumed control of the franchise's magazine in New York, reviving what many saw as a stagnating publication. Her use of the magazine to shape the fashion industry has been the subject of debate within it. Animal rights activists have attacked her for promoting fur, while other critics have charged her with using the magazine to promote elitist views of femininity and beauty. A former personal assistant, Lauren Weisberger, wrote the 2003 bestselling roman à clef The Devil Wears Prada, later made into a successful 2006 film starring Meryl Streep as Miranda Priestly, a fashion editor, believed to be based on Wintour. In 2009, she was the focus of another film, R. J. Cutler's documentary The September Issue.

Because of her position, Wintour's wardrobe is often closely scrutinised and imitated. Earlier in her career, she mixed fashionable T-shirts and vests with designer jeans. When she started at Vogue as creative director she switched to Chanel suits with miniskirts. She continued to wear them during both pregnancies,opening the skirts slightly in back and keeping her jacket on to cover up. Wintour was listed as "one of the fifty best-dressed over 50s" by The Guardian in March 2013.

Through the years, she has come to be regarded as one of the most powerful people in fashion, setting trends, and anointing new designers. Industry publicists often hear "Do you want me to go to Anna with this?" when they have differences with her subordinates. The Guardian has called her the "unofficial mayoress" of New York City. She has encouraged fashion houses such as Christian Dior to hire younger, fresher designers such as John Galliano. Her influence extends outside fashion. She persuaded Donald Trump to let Marc Jacobs use a ballroom at the Plaza Hotel for a show when Jacobs and his partner were short of cash. More recently, she persuaded Brooks Brothers to hire the relatively unknown Thom Browne. A protégée at Vogue, Plum Sykes, became a successful novelist, drawing her settings from New York's fashionable élite. Her salary was reported to be $2 million a year in 2005. In addition, she receives several perks, such as a chauffeured Mercedes S-Class (both in New York and abroad), a $200,000 shopping allowance, and the Coco Chanel Suite at the Hotel Ritz Paris while attending European fashion shows. Condé Nast president S.I. Newhouse had the company make her an interest-free $1.6 million loan to purchase her townhouse in Greenwich Village.