Moritz, Prince of Dietrichstein (Moritz Joseph Johann; 19 February 1775 – 29 August 1864), was a German prince member of the House of Dietrichstein, 10th and last Prince (Fürst) of Dietrichstein zu Nikolsburg, Count of Proskau-Leslie, Baron (Freiherr) of Hollenburg, Finkenstein and Thalberg.
Born in Vienna, he was the seventh child and fourth (but third surviving) son of Karl Johann Baptist, 7th Prince of Dietrichstein, and Maria Christina Josepha, a daughter of Jan Josef FrantiÅ¡ek AntonÃn, Count of Thun-Hohenstein.