Princess Maria Teresa Maddalena of Bourbon-Two Sicilies (Full Italian name: Principessa Maria Teresa Maddalena di Borbone delle Due Sicilie) (15 January 1867, Zürich, Switzerland – 1 March 1909, Cannes, France) was the only child of Prince Louis of Bourbon-Two Sicilies, Count of Trani (heir apparent of the defunct throne of the Two Sicilies) and his wife Duchess Mathilde Ludovika in Bavaria. Maria Teresa was a member of the House of Bourbon-Two Sicilies and became a member of the House of Hohenzollern-Sigmaringen and titular Princess of Hohenzollern through her marriage to Prince Wilhelm of Hohenzollern (later Prince of Hohenzollern). She was called Mädi in the family and had a lifelong friendship with her cousin the Archduchess Marie Valerie of Austria.