Franz Joseph Maximilian Maria Antonius Ignatius Lamoral, 9th Prince of Thurn and Taxis, full German name: Franz Josef Maximilian Maria Antonius Ignatius Lamoral Fürst von Thurn und Taxis (21 December 1893, Regensburg, Kingdom of Bavaria – 13 July 1971, Regensburg, Bavaria, Germany) was the ninth Prince of Thurn and Taxis and Head of the Princely House of Thurn and Taxis from 22 January 1952 until his death on 13 July 1971.

Franz Joseph was the eldest son of Albert, 8th Prince of Thurn and Taxis and his wife Archduchess Margarethe Klementine of Austria.

His christening was attended by Franz Joseph I of Austria. Franz Joseph had six younger brothers and a sister. One of his brothers was Prince Max Emanuel of Thurn and Taxis (1902–1994), a member of the Order of Saint Benedict known as Pater Emmeram.

Franz Joseph received a humanistic education by private teachers. Beginning in the winter semester of 1912, Franz Joseph studied at both the University of Strasbourg and University of Leipzig. Because of the outbreak of World War I, he could not complete his studies. On 6 August 1914, Franz Joseph joined the Prussian Elite Regiment Garde de Corps.

During the war, he was promoted to lieutenant. After the war's end in January 1919, Franz Joseph returned to Regensburg.

Franz Joseph married Princess Isabel Maria of Braganza, daughter of Miguel, Duke of Braganza and his wife Princess Maria Theresa of Löwenstein-Wertheim-Rosenberg, on 23 November 1920 at Schloss Bronnbach, Bronnbach, Wertheim, Bavaria, Germany.

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