Louise, Princess Royal and Duchess of Fife (Louise Victoria Alexandra Dagmar; 20 February 1867 – 4 January 1931) was the third child and the eldest daughter of King Edward VII of the United Kingdom and Queen Alexandra; she was a younger sister of King George V. She was the sixth daughter of a British monarch to be styled Princess Royal.

Princess Louise was born at Marlborough House, the London residence of her parents, then The Prince and Princess of Wales (later King Edward VII and Queen Alexandra). She spent much of her childhood at Sandringham House, her parents' country estate in Norfolk. Like her sisters, Princesses Maud and Victoria, she received limited formal education.

She was christened at Marlborough House on 10 May 1867 by Charles Longley, Archbishop of Canterbury.

With her sisters Maud and Victoria, she was a bridesmaid at the 1885 wedding of their paternal aunt Princess Beatrice, to Prince Henry of Battenberg.

On Saturday 27 July 1889, Princess Louise married the 6th Earl Fife (11 October 1849 – 12 January 1912), at the Private Chapel in Buckingham Palace. Two days after the wedding, Queen Victoria created him Duke of Fife and Marquess of Macduff in the Peerage of the United Kingdom. The letters patent creating this dukedom contained the standard remainder to "male heirs of the body lawfully begotten." However, it became apparent that the Duke and Duchess would not have a son. Therefore, on 24 April 1900, Queen Victoria signed letters patent creating a second Dukedom of Fife, along with the Earldom of Macduff in the Peerage of the United Kingdom with a special remainder: in default of a male heir, these peerages would pass to the daughters of the 1st Duke and then to their male descendants.

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