Victoria Christina Niarchos (née Guinness, born 30 January 1960) is a member of the non-aristocratic branch of the Guinness beer clan.
She is a daughter of Patrick Benjamin Guinness (1931-1965) (himself half-brother of the Aga Khan IV) and his wife (and stepsister), the former Dolores Guinness, Dolores Maria Agatha Wilhelmine Luise, Freiin von Fürstenberg-Hedringen (1936-2012), herself the daughter of the socialite Gloria Guinness (1912-1980) and Count Franz-Egon von Fürstenberg-Herdringen (1896-1975). She has two older siblings: Countess Maria Alexandra de Quatrebarbes born (b. 1956) and Loel Patrick Guinness (b. 1957).
The third and former wife of Greek shipping heir Philip Niarchos (b. 1954), she is the mother of: