Princess Catherine Alexandrovna Yurievskaya (9 September 1878 – 22 December 1959) (Russian: Екатерина Александровна Юрьевская, Ekaterina), was the natural daughter of Alexander II of Russia by his mistress, later his wife, Princess Catherine Dolgorukov. In her own family she was known as Katia. In 1880, she was legitimated by her parents' marriage.

After her father's assassination in 1881, her mother brought her up in France, and she was married there in 1901, having two sons, but was widowed in 1910. Her second marriage was during the Great War, in Russia, and she suffered hardships during the ensuing Russian Civil War. In the 1920s she became a professional singer. In 1932 she settled in England on Hayling Island, where she died in 1959.

Catherine was born at St Petersburg, Russia, on 9 September 1878, while her mother was still the mistress of Czar Alexander II. When she was two, her parents' morganatic marriage on 6 July 1880 brought about her legitimation, so that she gained the title of Svetlost, or Serene Highness.

Her father was assassinated in March 1881, when she was three, and she lived thereafter with her mother, brother George, and sister Olga, who settled together in France.

Catherine's mother took a house in Paris and others on the French Riviera. In 1891, she bought a house in Nice which she called the Villa Georges, in the boulevard Dubouchage. In France the family was able to afford some twenty servants and a private railway carriage.

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