Winifred May, Marquesa de Casa Maury (28 July 1894 – 16 March 1983), universally known by her first married name as Freda Dudley Ward, was an English socialite best known for being a mistress of the Prince of Wales, who later became King Edward VIII.
Born Winifred May Birkin, she was the second child and eldest of three daughters of Colonel Charles Wilfred Birkin (fourth son of a British textile magnate or lace king of Nottinghamshire, Sir Thomas Isaac Birkin, 1st Bt.) and his American wife, the former Claire Lloyd Howe. She was the mistress of the Prince of Wales from 1918 to 1923, after which she remained his close confidante until 1934 and the beginning of his relationship with Wallis Simpson.
The actress Jane Birkin is a distant relative; the elder daughter of a much younger first cousin.
Freda Birkin was twice married, firstly 9 July 1913 (divorced 1931) to The Right Honourable William Dudley Ward, Liberal MP for Southampton. They had two daughters. Though her first husband's family surname was Ward, the combination "Dudley Ward" eventually became their official surname, through common usage.
Her second husband was Pedro Jose Isidro Manuel Ricardo Mones, Marques de Casa Maury.