Marie Christiane Eleonore Prochaska (11 March 1785, in Potsdam – 5 October 1813, in Dannenberg) was a German female soldier who fought in the Prussian army against Napoleon during the War of the Sixth Coalition.

During these wars Prochaska disguised herself as a man and registered for 1 Jägerbataillon of the Lützow Free Corps under the name August Renz in 1813, serving first as a drummer, then later in the infantry.

In 1863, a commemorative marker was erected over Prochaska's grave at St.-Annen-Friedhof in Danneburg and in 1889 her home town of Potsdam created a monument to her memory ("Der Heldenjungfrau zum Gedächtnis", or "In memory of the maiden-heroine"), which still survives in the almost completely cleared Alten Friedhof (old cemetery).

Ludwig van Beethoven composed incidental music for a play by Johann Friedrich Leopold Duncker [de] about Prochaska, titled Leonore Prohaska.

Anna Lühring (1796–1866) joined the Lützower Jäger in 1814 under the name Eduard Kruse and survived the Napoleonic Wars, though her public fame faded quickly.