Princess Maria Carolina of Bourbon-Two Sicilies, Duchess of Castro (née Countess Maria Carolina Zamoyska) (22 September 1896 in Kraków, Austria-Hungary – 9 May 1968 in Marseille, France) was the wife of Prince Ranieri, Duke of Castro, claimant to the headship of the House of Bourbon-Two Sicilies.
Carolina was the sixth child and youngest daughter of Polish nobleman Andrzej Przemyslaw Zamoyski, Count Zamoyski and his wife Princess Maria Carolina of Bourbon-Two Sicilies.
Carolina's maternal grandparents were Prince Francis of Bourbon-Two Sicilies, Count of Trapani and his wife Archduchess Maria Isabella of Austria, Princess of Tuscany.