Princess Arthur of Connaught, 2nd Duchess of Fife, GCStJ (Alexandra Victoria Alberta Edwina Louise; née Duff; Princess Alexandra, Duchess of Fife before marriage; 17 May 1891 – 26 February 1959) was a granddaughter of King Edward VII and great-granddaughter of Queen Victoria.

Alexandra's father was Alexander Duff, 1st Duke of Fife. Having succeeded his father as the 6th Earl of Fife, he was elevated to Duke of Fife and Marquess of Macduff in the Peerage of the United Kingdom two days after his marriage in 1889 to Princess Louise of Wales, the eldest daughter of Albert Edward, Prince of Wales, the future Edward VII. Princess Louise accordingly became the Duchess of Fife.

Alexandra was born at East Sheen Lodge, Richmond on 17 May 1891. After ten years of marriage and the birth in 1893 of Alexandra's younger sister Maud, no more children would be born to Alexandra's parents and the dukedom and marquessate of Fife were headed toward extinction since only a male heir could inherit those titles. On 24 April 1900 Queen Victoria granted Alexander Duff a second dukedom of Fife, along with the earldom of Macduff, stipulating by special remainder that these two titles would jointly devolve, in default of sons born to him and the Queen's granddaughter, upon their daughters in order of seniority of birth, and upon their respective agnatic male descendants in the same order.

As a female-line granddaughter of the British monarch, Alexandra was not entitled to the title of "Princess of the United Kingdom Great Britain and Ireland", nor to the style of Her Royal Highness. Instead she was styled Lady Alexandra Duff, as the daughter of a duke, even though she was born fifth in the line of succession to the British throne.

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