Prince Alessandro della Torre e Tasso, 1st Duke of Castel Duino, full German name: Alexander Karl Egon Theobald Lamoral Johann Baptist Maria, Prinz von Thurn und Taxis (8 July 1881 in Schloss Mzell, Mzell, Kingdom of Bohemia, Austria–Hungary – 11 March 1937 in Castel Duino, Duino, Kingdom of Italy) was a member of the Bohemian branch of the princely House of Thurn and Taxis.
Alessandro was created Prince della Torre e Tasso and first Duke of Castel Duino by Victor Emmanuel III of Italy after relocating to the Kingdom of Italy in 1923.