Antoinette Roberte Sophie Wilhelmine (7 October 1899 – 31 July 1954), commonly referred to as Antonia, was the last Crown Princess of Bavaria before World War II. By birth, she was a member of the Luxembourgish House of Nassau-Weilburg as the child of Guillaume IV, Grand Duke of Luxembourg and Infanta Marie Anne of Portugal. Antoina was a survivor of the Sachsenhausen concentration camp.